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Natural Magick 

Book 16

The Sixteenth Book of Natural Magick
John Baptista Porta
(Giambattista della Porta)
(1537-1615)

"If Invisible Writing."
("Wherein are handled secret and undiscovered Notes.")

"The Proeme"
Chapter I - "How a writing dipped in diverse Liquors may be read."
Chapter II - "How letters are made visible in the fire."
Chapter III - "How Letters rubbed with dust may be seen."
Chapter IV - "How you may write in an Egg."
Chapter V - "How you may write in diverse places, and deceive on that can
read."
Chapter VI - "In what places Letters may be enclosed."
Chapter VII - "What secret Messengers may be used."
Chapter VIII - "How messengers may be sent, who shall neither know that they
carry letters, nor can they be found about them."
Chapter IX - "How characters may be made, that at set days shall vanish from
the paper."
Chapter X - "How we may take off letters that are written upon the paper."
Chapter XI -"How to counterfeit a seal and writing."
Chapter XII - "How you may speak at a great distance."
Chapter XIII- "By night we may make signs by fire, and with dust by day."

The Proeme
I make two sorts of secret marks, which they vulgarly call Syfers.  One of
visible marks, and is worthy of a treatise by itself.  Another of secret
marks, whereof I have attempted to say something in this present volume, and
what are the consequences thereof, for the use of great men, and princes,
that take care for things absent, and write to some man that knows this
invention.  I shall set down plainly some examples.  But these things and
the consequences of them must be faithfully concealed, lest by growing
common among ordinary people, they be disrespected.  This is that I shall
publish.


Chapter I
"How a writing dipped in diverse Liquors may be read."
There are many, and almost infinite ways to write things of necessity, that
the characters shall not be seen, unless you dip them into waters, or put
them near the fire, or rub them with dust, or smear them over.  I shall
begin with them that are read by dipping them into waters.  Therefore,
"If you desire that letters not seen may be read, and such as are seen may
be hid."
Let Vitriol soak in boiling water.  When it is dissolved, strain it so long
till the water grows clear.  With that Liquor write upon paper.  When they
are dry, they are not seen.  Moreover, grind burnt Straw with Vinegar, and
what you will write in the spaces between the former lines, describe at
large.  Then boil sour Galls in white Wine, wet a sponge in the Liquor.  And
when you have need, wipe it upon the paper gently, and wet the letters so
long until the native black color disappears.  But the former color, that
was not seen, may be made apparent.  Now I will show in what Liquors paper
must be soaked to make letters to be seen. As I said, dissolve Vitriol in
water.  Then powder Galls finely, and soak them in water, let them stay
there twenty-four hours.  Filter them through a Linen cloth, or something
else, that may make the water clear, and make letters upon the paper that
you desire to have concealed.  Send it to your friend absent.  When you
would have them appear, dip them in the first Liquor, and the letters will
presently be seen.
"That dipping a Linen rag in water, the letters may appear."
Dissolve Alom in water, and with it make letters upon white Linen, sheets,
napkins, and the like.  For when they are dry, they will presently vanish.
When you will have the visible, soak them in water, and the Linen will seem
to be darkened.  But only where the Alom has written, it will not.  For the
letters will grow so clear, the you may read them.  For where Alom, Vitriol
, and the astringents are dissolved, those parts will admit water last.  So,
"White letters are made with waters."
Litharge is first powdered and cast into an earthen pot that has water and
Vinegar mixed.  Boil it and strain it and keep it.  Then write letters with
Citron Lemon juice.  These are added to them when they begin to dry.  If you
dip them in the Liquor kept, they will appear clearly and very white.  If
women's breasts or hands be wet in it, and you sprinkle the said water on
them, they will grow white as Milk.  Use it.  If at any time you want these,
if you please,
"A stone dipped in Vinegar will show the letters."
Make letters with goat fat upon a stone.  When they are dry, they will not
be seen.  If the stone be dipped into Vinegar they presently come forth, and
seem above the stone.  But if you would have letters written with water
only, appear black, that the better you may be provided, and more speedily
for a voyage, Galls  and Vitriol finely, and strew this powder on your
paper.  Rub it with a cloth, and polish it well, that so it may stick to the
paper and be like it.  Powder Juniper Gum, which Scriveners call Vernish,
and add it to the rest.  When you would use it, write with water or Spittle,
and they will be black letters.  There are many such arts, too tedious to
relate.

Chapter II
"How letters are made visible in the fire."
I shall show the ways how letters are not made visible by the fire, or not,
unless light interpose, or may be read when they are burned.  But,
"To make letters visible by fire."
So we may bring forth letters written between the verses, and in the close
setting together, or larger distances of syllables.  Let the epistle contain
some void space, that the  letters may not be seen, and if this be
intercepted, it will hardly be read.  If you write with the juice of
Citrons, Oranges, Onions, or almost any sharp things, and you make it hot at
the fire, their acrimony is presently discovered.  For they are undigested
juices, whereas they are detected by the heat of the fire, and then they
show forth those colors, that they would show if they were ripe.  If you
write with a sour Grape that would be black, or with Cervises, when you hold
them to the fire, they are concocted, and will give the same color they
would in due time give upon the tree, when they were ripe.  Juice of Cherry,
added to Calamus, will make a green, so also Sow-bread, a red.  So diverse
juices of fruit will show diverse colors by the fire.  By these means, maids
sending, and receiving love letters, escape from those that have the charge
of them.  There is also a kind of Salt called Ammoniac, this, powdered and
mingled with water, will write white letters, and can hardly be
distinguished from the paper.  But hold them to the fire, and they will show
black.  Also,
"Letters that cannot be read unless the paper be burnt."
For the mixture will be white, and nothing will be seen, but when it is
burnt, the paper will be black, and the characters will be white.  Take the
sharpest Vinegar and the white of an Egg.  In these, steep Quicksilver, and
stir it well, and with that mixture make letters on the paper.  Burn the
paper in the fire, and the letters will remain unburnt.  Or make the letters
on the paper with Gum, or any kind of Salt or Lime.  These being they cannot
be seen at the fire, when the paper is burnt and made black, they will
appear white.  If you will, you may,
"Write letters that cannot be seen but by interposition of fire."
Do it thus.  Mingle Ceruse, or some other white color, with Gum Traganth,
soaked, and of this mixture is made a matter of the same color with the
paper, that it cannot be discerned from it, nor cause suspicion.  Then this
is put between the eye and the light of a candle, the eye cannot pass
through where the letters are written, and you shall see them darkly.  This
is the reason of the optics.  For that part of thick matter opposed against
outward light, hinders it, that the rays cannot come to our sight.  And so
the prints of the letters are seen as a shadow.

Chapter III
"How Letters rubbed with dust may be seen."
Now I will use another artifice, that letters rubbed with dust may be read,
that were before invisible, which I read was used by the ancients.
Wherefore do thus,
"That Letters rubbed with mill dust may be read."
That as in paper, so on some unseen parts of the body, letters written may
lie hid, and be opened when need is.  Write secretly on your back or arms,
or other limbs, with Vinegar or Urine, and dry it that nothing may appear.
Now, to have it read, rub it over with soot or burnt paper, for so the
letters will shine forth.  Or,
"Otherwise,"
If you make letters with fat, Tallow or any other fatty substance, or with
Gum, or milk of a Fig tree, and strew them with dust of coal or burnt paper,
they will appear.  It may be by this craft, as Polyanus the Greek says,
Attalus used the imprinted inscription of a beast for sacrifice.  He, to
raise the valor of his Soldiers, to make them fight valiantly with their
enemies, the French, that were far more in number, supposing it would be no
little advantage to put them in hopes before hand of the assurance of
victory, invented a trivial business, but otherwise profitable, with the
priest that was to offer sacrifice.  Before the day they were to fight, he
prepared for the victory.  For Sudinus the Soothsayer, being to offer
sacrifice, prayed unto the gods, and cuts the sacrifice in two.  But the
king used powdered Gum, and from the right to the left side, the drew these
words, "Regis Victoria," "...the Victory is the King's...,"  And when the
entrails were drawn forth, he thrust his hand into the hottest and most
spongy place, and wiped clean the inscription.  But the Auger, changing the
other parts, and doing his office, turns the part where this inscription was
contained, "Regis Victoria."  The matter was no sooner published, but the
Soldier generally rejoiced, and shouted exceedingly, to show how ready they
were to fight, so going on with a certain assurance of the victory.  And
depending on this promise from the gods, they fought courageously, and
subdued the French.  But to the matter.  Milk of the Fig tree will do the
same, if it be written on white paper, and afterwards sent to a friend, be
rubbed with coal dust strewn upon it, and made clean again, so will the
letters presently appear black.  Pliny says, the milk of  Tithymals will to
the like, to make the letters, and dust strewn on them to scower them.  And
thus women as he says, had rather speak with adulterers, then by letters.
Ovid confirms this, admonishing maids in his Arte Amandi, how they may
safely write to their sweethearts.
"Write with new Milk, it's safe, unseen, but read
The writing with coaldust laid on full-right.
Moist flax will write as if that none had been,
And letters on your paper pass the sight."
Also there is an art that one would not imagine, to write upon Crystal.
For, being all transparent, no man will dream of it, and the letters lie hid
within.  Do it thus,
"That letters may appear upon Crystal by strewing on of fine dust."
Dissolve Gum Arabick in water, or Gum Traganth, that it may be clear, and
when it is well dissolved, it will not foul the Crystal, if you write upon
it, or upon a cup or glass, for when the letters are dry, they are
invisible.  No man will imagine the fraud, if a cup be sent to prison, or a
glass full of wine.  When he would see the letters, rub burnt straw or paper
on it, and the letters will presently be seen.  Here is another secret,
"The letters on the paper may be read, not by fire, nor water, or any other
thing, but in the dust only."
This is a secret worth knowing.  Dissolve Goat Suet with a little
Turpentine.  Rub the paper with this Liquor, and keep it.  When you would
send some news to your friend, lay on the paper smeared with the fat upon a
letter you would send to your friend, write upon that win an Iron point, and
the suit will make the characters on the letter.  Send this away, and if it
be intercepted, no water will make the words visible, or any other art, but
only strewing dust upon it.  Also you may make,
"That upon black paper, white letters may appear."
The reason is this.  Mingle the white and yolk of an Egg together, that it
may be liquid as ink.  With this Liquor, write on the paper what words you
please, and dry them.  When the paper is dry, make a black color over it,
and dry it again, and send it.  But that the letters may be visible, scrape
the superficies of the paper with a broad Iron.  For so it will be, that the
ink being scraped off, where the letters were, they will appear white.

Chapter IV
"How you may write in an Egg."
Because when prisons are shut, Eggs are not stopped by the Papal
Inquisition, and no fraud is suspected to be in them, I will show you how
letters may be writ on the upper shell and white of an Egg also.  For
example,
"That letters may be writ on the Eggshell."
Wrap the Egg in Wax, and with an Iron point make letters on it, as far as to
the shell, but break it not.  For if you break the shell with your Iron, or
point, or knife, it may be detected.  Soak your Egg one night in strong
water of depart, which separates Gold from Silver.  In the morning take away
the Wax, and take off the Eggshell's cover, and hold the shell between your
eye and the light, and the letters will be seen very clear quite through the
transparent shell.  The same is done with the juice of Lemon.  For it
softens the shell, but fouls it not, and you shall have your desire.  Will
you,
"That letters may be seen upon the white."
Yellow, and better when the Egg is boiled.  Boil an Egg hard and roll it in
Wax, and engrave the letters on the Wax with an Iron point, that the marks
may lie open.  Put this Egg into Liquor with Alom and Galls powdered.  Then
put it into sharp Vinegar, and they will penetrate, and taking off the
shells, you shall see them in the white of the Egg.  Africanus teaches it
thus.  Grind Galls and Alom with Vinegar, till they be as thick as ink.
With this write what you will on an Egg, and when the writing is dried in
the Sun, put it into sharp Pickle.  Dry it, boil it, and take off the shell,
and you shall read the writing.  I put it into Vinegar, and could do nothing
of it.  Perhaps, he means by Pickle, Capital Lees.  The cause is this.  The
Eggshell' is porous, and has large holes, which is plain.  For being set to
the fire, it will sweat, and water will come forth.  And looking at it
against the light, it will show clear.  So then, Vinegar being subtle,
penetrates by the pores, and makes the shell tender.  And when it is mingled
with the Alom and Galls, it carries their substance with it, and makes them
appear on the white.  And when it is put into cold water, it is condensed,
and comes to be hard as it was.  But observe, it must not stay long in
Vinegar.  For that will eat off all the shell, and will leave the Egg bare,
having nothing but a thin skin to cover it.  And if you put that into cold
water, the shell will not come again.  If you will know,
"How letters writ with water, may be seen in an Egg."
Dissolve Vitriol in the water, and write upon the shell, and dry it, and
nothing will be seen.  If you will read it, dissolve Galls in Wine, and
steep the Egg therein.  Or, write with Lime water upon an Egg, and steep it
in Lye where Brasil is Infused, and so the letters will seem to be of a
violet color.  Or, write with Suet upon the shell, and steep it in water of
Vitriol .  When it is dry, scrape off the Suet, and nothing will bee seen.
When you afterwards steep it in the foresaid Wine, white letters will appear
in a black shell.  I shall show,
"How letters may become visible upon an Egg by the fire."
Write on the Egg with the juice of Lemon, or Onion, or Fig milk.  When you
put this to the fire, the letters will appear yellow.  And that must be done
on a raw Egg.  For if you boil it, the letters will be seen.
"That letters may be seen on the Eggshell by dust."
Make letters on the shell with Vinegar, suet, fig tree milk, or of Tithymal,
or with Gums.  When you would have them seen, rub them with Coal dust, or
burnt Straw, or paper, and they will seem black.  There is a way,
"How to put a letter into an Egg."
Make your letter that you send, narrow and long, scarce broader then your
middle finger.  Write your mind in short characters, and with the edge of a
knife, make a cut in the Egg, and break the inward skin, and put in your
letter at one end by degrees.  For it will easily take it in, were it ten
hands breath.  Then stop the cut, with Lime and Gum mingled, that it may not
be seen, and with Ceruse and Gum Traganth, for then it is impossible to
discern it.  But if you will have this done more neatly, put the Egg in
sharp Vinegar three or four hours.  And when you find it soft, open the
shell with the edge of your knife, put in your roll of paper.  Then soak it
in cold water, and the shell will grow as hard as it was.

Chapter V
"How you may write in diverse places, and deceive on that can read."
I have shown you diverse waysof writing invisible.  Now I come to those ways
that will teach you to write letters on diverse things, which though they be
visible, and intercepted, yet the readers will be deceived by their secret
device.  First,
"How to write on a small thread."
Let us see how they did this in elder times.  Gellus noct.Attic. relates,
that when the Lacedaemonians wrote to their generals, that their letters
being intercepted by the enemies might not be read, invented this kind of
writing.  yet it is referred to Archimedes to be the inventor of it.  Two
sticks must be made long and round, and polished with the Turners
Instrument.  They must be equal for length, breadth and thickness.  One of
these was given to the general when he went forth to war, and the other was
kept home by the senate.  As often therefore as the need was, a page was
rolled about the stick, as large as could contain the matter, that it might
make a round volume, and the sides of it were so well joined, that they were
like a collar that exactly fitted the wood, and no chinks between.  Upon
this collar, that thus was rolled about the stick, they wrote letter
overthwart, from top to bottom.  The collar thus written on, being long and
narrow, was taken off from the stick, and sent to the general.  For they
thought, if it was intercepted by the enemy, when they saw bits of letters,
and syllables, and of words, so far divided, they would never discern the
thing.  And they were not deceived in this conjecture.
"How to write on parchment, that the letters may not be seen."
When you have written on parchment, put it to the light of a candle, or to
the fire, and it will all crumble and run together, and be nothing like it
was.  If a man look on it, he will hardly suspect any fraud.  If he desires
to read what is in it, let him lay it on moist places, or sprinkle it gently
with water, and it will be dilated again, and all the wrinkles will be gone.
And it will appear as it did at first, that you may read the letters upon
it, without any hindrance. Now I will show the way,
"How in the sections of books the characters shall be hid."
When the book is well bound , and cut and colored black.  If we open it, and
turn back the leaves, that they may be turned in, we may write at the
corners of the leaves what we will.  But when the book is set back again,
and the leaves put into their own places, nothing is seen or can be imagined
to be writ in them.  But he that would read those letters, must set the book
that way as it was, and the letters will be read.  So may we write on
Fly-traps, that are made with wrinkles, and then draw them forth.   If need
be, we may do,
   "The same with cards to play with."
You may excellent well write on cards, if you put them in some order, that
one may follow the other.  And some to be held upright, others turned
downwards.  When you have set them right together,you may write all things
where they divide.  Mingle the cards together again, and turn them.  And
nothing will be seen but some disorderly marks, if any man look curiously
upon them.  But he that would read them, must set them in order, and they
will join and read exactly.  Also, we may write in white Pigeons, and other
white birds, feathers of their wings, turning them upwards.  For when they
return to their own places, they will show nothing.  But if they be brought
to their former posture, you will read the letters.  And this is no small
benefit for those that shall use them for messengers.  There is a way,
"To hide letters upon wood."
Anyone may make letters upon wood, and not be suspected.  For they shall not
be seen, but when we please.  Let the wood be fleshy and soft, of Poplar, or
Tile tree, or suchlike.  And with those Iron markers printers use, when they
make stamps upon Brass, commonly called Ponzones, make letters in the wood,
half a finger thick.  Then hew the wood with a carpenter's hatchet, as deep
as the letters go.  When all is made plain, and equal, send the stick to
your friend, or board, to him that knows the matter.  He putting the wood
into the water, the wood will swell out, that was beaten in with the marks,
and the letters will come forth.  That we may do in wooden vessels, polished
by the Turner, if when they are turned, we mark the letters on them.  And
then turn them again.  When this is done, send it to your friend, and let
him soak it in water, etc.

Chapter VI
"In what places Letters may be enclosed."
I shall speak in what places letters may be enclosed, and not be suspected.
And I shall speak last of carriers.  I shall bring such examples as I have
read in ancient histories, and what good a man may learn by them.  First,
"How to hide letters in wood."
Theophrastus's opinion was, that if we cut the green bark of a tree, and
make it hollow within, as much as will contain the letters, and then bind it
about.  In a short time it will grow together again, with the letters hut up
within it.  Thus he says, that by including some religious precepts in wood,
people may be allured.  For they will admire at it.  But I mention this out
of Theophrastus, rather for a similitude, then for to do the thing I would
have, for that would require a long time.  But his may be done well in dry
wood, as in Fir.  Thus, the chinks fastening together with common white
glue.  Also the ancients used,
"To conceal letters in Junkets."
I will relate the cunning of the wife of Polycretes.  For she, while in the
Milesian camps they solemized a solemn feast of their country.  When they
were all fast asleep, and drunk, took this opportunity to tell her brothers
of it, and did thus.  She desired Diogentus, general of the Erythrei, that
she might send some Junkets to her brothers.  and when she had leave, she
put a leaden scroll into a cake, and she had the bearer tell her brothers
from her, that no man should eat of it but themselves.  When they heard
this, they opened the cake, and found the letter, and performed the contents
of it.  They came upon the enemy by night, at was dead drunk a the feast and
conquered him.  Also the ancients were wont,
"To shut up letters in living creatures."
Herodotus says, that Harpagus sent letters to Cyrus, put into the belly of a
Hart whose entrails were taken out, by one that counterfeited a shepherd
hunting.  So,
"Letters to be hid in garments."
The secret places of clothes are best, to avoid suspicion.  As in your
bosom, or under the soles of your feet.  Ovid in his Arte Amandi, writes to
this purpose,
Letters may be concealed in your breast,
Wrapt in a clowt, which way is held the best;
Or else you may under your feet provide
A place full closely Letters for to hide.
"To hide letters in your belt."
Those of Campania were wont, when they would discover anything to the
Carthaginians, and the Romans besieged them round.  They sent a man that
seemed to run from them, with a letter concealed in his Girdle.  And he
taking occasion to escape brought it to the Carthaginians.  Others carried
letters in their Scabbards, and sent them away by messengers, and were not
found out.  But we use not adays,
"To hide letters in the bowels of living creatures."
For we wrapt them in some meat, and give them to a Dog, or some other
creature to swallow.  That when he is killed, the letters may be found in
his belly.  And there is nothing neglected to make this way certain.  The
like was done by Harpagus.  He, as Herodotus says, being to discover to
Cyrus some secrets, when the ways were stopped, that he could do it by no
other means, he delivered the letters to a faithful servant, who went like a
hunter, that had caught a Hare.  And in her belly were the letters put.
When the guts were taken forth, and so they were brought to Persis.  We use
also,
"To shut up letters in stones."
Flints are beaten very fine in brazen Mortars, and sifted. Then are they
melted in a Brass Cauldron, by putting two ounces of Colophonia to one pound
of the powder of the stone, and mingling them.  Put your letters into leaden
plates, and hide them in the middle of the composition, and put the lump
into a Linen bag, and tie it fast, that it may be round.  Then sink it into
cold water, and it will grow hard and appear like a Flint.

Chapter VII
"What secret Messengers may be used."
The Ancients used the same craft for messengers.  For they used men that
should be disguised by their habits, and some living creatures besides.
For,
"To counterfeit the shape of a Dog,"
It was the crafty counsel of Josippus, that the messengers should be clad
with skins, and so they past the enemie's guards, and were not regarded.
For if they were seen, they were in the likeness of Dogs.  And this was done
until the enemy found out the trick, and compassed the Rampart round about.
And man's curiosity was not satisfied here, till they found means for ways
to pass, where the sentinels and scouts might not discover them.  Wherefore
they left the land, and sent by water.  But that the writing might not be
spoiled in the water, as Frontinus says, the Soldiers that pass over the
river Saltella, had leaden plates writ upon, fastened to their arms.  But
Lucullus, as the same Frontinus reports, that he might declare to the
Cyziceni, that were besieged by Mithridates, that he was coming to relieve
them, all narrow passages being stopped by the enemy guards, that were
joined to the continent by a small bridge, he fought a way by sea.  For a
private Soldier reappointed for it, sitting on two bladders blown, wherein
the letters were put in two covers, and so like some sea monster, he swam
seven miles at sea, and told of the coming of the general.  So they often
used,
"Arrows for messengers."
But that seemed not sufficient, for they feared men's cunning, lest some
chance or fraud might intercept the messenger, and the secret should be
discovered, or they should be racked to make them confess.  Sometimes
therefore they sought a way in the air, and used arrows for messengers, that
none might intercept them.  Herodotus says, that Artabazus and Timoxenus did
this, when one would declare anything to the other.  For the paper was
folded about the foot of the arrow, and the feathers were put upon it, and
it was so shot into the place appointed.  To this pertains the example of
Cleonymus King of the Lacedaemonians.  He besieging the city Troezene,
commanded many of his best archers to shoot arrows into several places.  And
he wrote upon them.  I come to relieve your city.  And by this means he set
ladders, and his army scaled the walls and went in, and plundered the place,
and destroyed it.  But when Caesar heard that Cicero besieged by the French,
could hold out no longer, he sent a Soldier by night, who should shoot a
letter, fastened to an arrow, over the wall.  When he had done this, the
watch found the arrow and the letter, and brought it to Cicero.  In it were
the words written:  Caesar bids Cicero be confident, and to expect relief.
So Caesar came suddenly, and slaying the enemies, relieved him.  We can do
it safer and better now adays with Guns.  If the matter to be sent be
contained in a few words, we may shoot them forth with Muskets.  Namely, by
folding up the paper, putting it into a case of Lead, were they cast
bullets, pouring upon it melted lead, but not burning hot.  The paper wrapt
up in the Lead, we shoot away with the powder to the place.  But because the
letters are but small we may shoot many of them in a day.  The way to melt
the ball is, by putting it to a gentle fire, or into Quicksilver, and it
will soon melt, and the paper not be touched.  I shall show how,
"How to make Pigeons your messengers."
We may use birds for messengers.  As Pigeons, Swallows, Quail and others.
For these birds carried to other places, when need is, if you bind letters
to their necks or feet, they will return with them.  And when anything was
suddenly to be related, the Ancients sometimes used these messengers.
Hircius being Consul, as Frontinus testifies, sent forth Pigeons from the
nearest place he could from the walls, which had been long shut up in the
dark, and half famished, to Decius Brutus, who was besieged at Matina by
Anthony.  They being glad of light, and desiring meat, flew and sat upon the
highest parts of the houses.  Brutus caught them, and so was confirmed of
how things were.  Wherefore, always laying meat in those places, he called
them back again.  Hence Pliny.  Nor ramparts, nor scouts, nor nets pitched
before rivers, did profit Anthony.  For the messenger went through the air.
By the same way, in the very same day, from Olympi to Aegina, was the
victory of Taurosthenes declared to his father.  Though others say it was
foreseen.  Others say, that Taurosthenes, when he went forth, took a Pigeon
from her young ones, yet weak and not able to fly, and as soon as he had
conquered, he sent her back again, purple colored.  And the making great
haste to her young ones, flew that very day from Pisa to Aegina, Aelian
writes this.  Some have sought to do this by Swallows, taken out of their
nests from their young, and sent back again.  Some also attest, that beyond
sea eastward, there are Pigeons that when the way is stopped, will fly
through the midst of the enemies, and carry letters under their wings, a
very long way.  It may be Juvenal meant this, when he said,
As if from divers parts a letter were
Brought with a duffel wing quite through the air.
Also in old monuments and histories it is declared, that there was a King of
Egypt, whose name was Marrhes, who bred up a tame Rook, and this he made use
of for a winged messenger, so often as he had need.  For, as if she had
reason, she would carry the letter where she was directed.  For she was so
crafty, as to be instructed whither to fly, and where to stay, or rest at
any time.  Man's wit has invented these shifts to avoid danger.  But by the
same craft is he wounded sometimes, as it were with his own weapons.  When
the Christians with an army besieged Ptolemais, when Saladin had appointed a
Pigeon to be sent thus with letters to the besieged, to with them be
constant, and expect his coming suddenly.  The Christians caught her, and
tied a contrary letter to her, and sent her away.  Whence it fell out, that
they despairing of relief, yielded themselves.  So there can be no certain
security in human affairs, but there may be fraud in all things.  Themistius
says, that among animals, Pigeons have the best memory, as having a clear
and refined mind.  Wherefore, though all other animals make hast to their
young ones, when they are taken from them, yet none of them carried far, can
come back, because their memory fails.  I have seen the trial with Pigeons.
When my servant came from my farm, he brought home some young Pigeons taken
from their Dams, and he wrapped them up in a cloak as we went.  And when we
came home at night, they were shut up in the house.  But when the morning
came, they flew out of the windows.  And discovering the country afar off,
they took upon the wing, and flew all home again.  Wherefore in Genesis,
Noah sent forth a Pigeon which returned.  But the Raven returned not.  For
the Raven wants memory.  I remeber in Plutarch's works, what is worth
relating that I read there, that by the Pigeon sent forth of the Ark, in
Deucalions flood, was shown, that the waters were sunk down, and the storms
past.  Animals that have newly brought froth young ones, will do the same.

Chapter VIII
"How messengers may be sent, who shall neither know that they carry letters,
nor can they be found about them."
Our ancestors had another art that could not be discovered, invented by
strange craft.  Herodotus mentions it from Hestiaus, who was the author of
it.  He being born in Asia, when of noble place, when Darius ruled, when he
was with the King in Persia, and would privately write to Aristagoras to
fall from him, fearing lest if he should not do it cunningly, he should be
discovered, and be in great danger, he invented this way.  He shaved off his
servants hair of his head, as though he meant to cure him, who for a long
time had been troubled with sore eyes.  And on his head, with good ink, he
wrote letters, that contained what he meant to have done.  He kept this
fellow at home with him, until his hair was grown again.  When that was
done, he sent him away to Aristagoras, bidding him say, when he came to him,
that he should do unto him, in shaving off his hair, as he did before.  When
the servant came to Aristagoras, to Milesum, he said what his master had him
sy to Aristagoras.  He supposing the business not to be idle, did what he
was ordered, and so read the message.  The Ancients found out these
inventions, to send messengers with.  Yet that can be no safe way, to shave
off the hair, and to write letters upon the head, for the head will easily
sweat, and put them out.  and if the skin be pricked with a needle, this
will not avoid suspicion, if he that wears the writing, be laid hold on by
the way.  For then is there most diligent search.  For fear and necessity
will make men watchful, and they are never satisfied, till they have
searched every place.  Sometimes they try men by fair promises, sometimes
they frighten them with threats.  And if these will not do, they torment and
torture them., to make them confess.  And if this will not do, that letters
may not be secretly conveyed, not only their hose and shoes use to be
searched, their clothes plucked off, and the seams ripped, but they will
search their very guts.  So far is it from keeping any secret upon the head,
that shall not be looked for.  But I can send letters, and write so, that it
can be understood by none, but those that the letters are designed for.  And
he that carries them never so far off, if he should be taken by the way, and
examined by torments, he can confess nothing, because he knows nothing of
it, and the letter shall always remain secret.  Nor will length of time, or
sweat in travel, blot out the letters.  Nor is it any matter if the
messenger pass through rivers, seas, or rain.  For wet will not hurt them.
What good princes may get by this, i leave to your cogitations.  For they
have most need of this, when they would declare anything to their friends
that are besieged.  And often upon one message, may the victory of a city or
army depend.  The invention of the Ancients, was partly good, and partly
bad.  They wrote letters on the head, which he could not read.  Nor would
water or sweat, wash them off, because they were printed into the head.  And
when the hair grew out, they could not be seen.  And that the messenger
might be ignorant what was written upon his head, they took occasion for it,
saying, he had a pain in his eyes, that they would cure.  And thus he knew
not the craft they used.  But this fraud seems not very secure.  For one
that should suspect it might shave off the hair and find out the secret.
Moreover, if the messenger were to be sent suddenly, how could he stay a
month, till his hair were grown again?  And when his skin was pricked for to
make the letters, he must suspect something.  But let us see,
"How Hestiaus could make the letters on his head indelible."
He wounded the skin with the point of a needle, or opened it with a razor,
and cast in the powder of Colophonia burnt.  For so we use to make the names
of masters upon the faces of bond slaves, that they shall never come forth,
and in time they will look green.  Also,
"Letters may be made between the skin, that are indelible, upon any part."
You may soon do it thus.  Let .Cantharides steep a whole day in strong
water, but sooner is it done in water separation.  Then make the letters
with a pen-knife, or fit instrument, upon the upper skin of the arm, or any
other part.  The flesh hurt with the moisture, will rise in blisters, and be
ulcerated.  So by the force of this corroding water, will there always
remain the prints of white letters, and they will never be blotted out.  And
this is best done by Hestiaus secret, because letters could not be read
under the hair, whereas white letters, like Milk, would be seen.  But would
we have them stay only for some time, and not always, we may do it many
ways.  If you make letters with Aquafortis, that has eaten Silver or Brass,
they will appear many days.  So it may be done with Oil of Honey.  Now I
will show,
"How a man may carry letters that are indelible and invisible, and unknown
to him; and how to make them visible when need is:"
You may do it thus:  By writing letters on the messengers back, that he may
not know of, having first given him an Opiate to make him sleep soundly,
then write, and let them dry in.  When he awakes, send him away, the letters
dried on will not be seen.  The Ancients know this.  Ovid says it:
"Write on his back, for paper, so you shall
Better conceal your purpose from them all"
But let us see whether we can write on the flesh with any Liquor, that
passing through rivers and rain, the letters may not be blotted out with any
moisture, and then by strewing on of dust, may be made visible again.  Write
on a mans back, which shall be visible only, by being wet with some Humor,
and no man can find out, unless he knows the secret.  If you write with
water, wherein Vitriol is dissolved, with a decoction of Galls, it will be
seen.  If it be made very sharp, it will pierce the skin, and the letters
will be delible.  We may do the same with the oil of it.  Salt Ammoniac with
Quicklime, or Soap, will make a blue color.  If they are rubbed with oil of
Litharge, they will appear white, with Aqua vita, or its equal, distilled
Vinegar, and water and Salt.

Chapter IX
"How characters may be made, that at set days shall vanish from the paper."
I shall attempt to show how letters may be written on paper, or in other
matter, that shall disappear at set times.  And other letters shall be made
invisible, that at a time certain shall disappear, not only useful secret
marks, but for other purposes necessary for our lives.  Letters that decay
and vanish, may be made two ways.  Either with Aqua fortis, that eats the
paper, or some decaying Liquors, that will vanish with any light touch, and
leave the place where they were, without any spot.  I shall teach,
"How letters are made, that eat the paper."
If you mingle Oil of Vitriol with common ink or any other black color, in
few days by corroding the paper, or the ink itself, the letters will vanish,
or in a month, as you put in more or less of the oil.  And this you may try
before you send away your letter.  If you would have it work more slowly,
add but a little oil.  If faster, put in more.  You may, when it is too
strong, put some water to it.  The same is performed, if you mix a strong
Lye, they call it Capital, with your ink.  For first they will be yellow,
and then they will vanish.  The same is done by Oil of Tartar, or Salt
Alkali, or Soda, and strong water of separation of Gold.  For these corrode
the letters, and the paper, that nothing of the letters will appear.  If you
desire to know,
"How letters may be made, that will soon vanish."
Make them with the strongest Aqua vita, or use Camphire and burned straws.
For the letters in time, will decay and vanish.  The Tincture will fall off,
when the glutinous matter is gone.  Make a powder of a very fine
Touch-stone.  For the sandy stone will sooner decay, that no letter shall be
seen.  Also it is done,
"Another way,"
Infuse the small filings of Steel in water of separation.  Take a triple
quantity of this, and add thereto liquid Pitch, or soot of Turpentine, to
make it blacker.  And cover the vessel.  Grind this on a Porphyry-stone,
write, and they will vanish and fall away.  This secret I thought not fit to
overpass, because it is the principal thing to be considered, to make trial
often.  For it it stay long on the paper, add more strong water to it.  And
if you be careful, no mark of the writing will remain.  You shall do it like
to this, another way.  If it be good so to counterfeit.  Take Chrysocolla,
Salt Ammoniac, and Alom, all alike.  Powder them all, and put them into a
Crucible, and make a strong Lye of Quicklime.  And laying a Linen cloth over
the mouth of the vessel, that must receive it, strain it.  Boil it a little,
and mingle this with your ink.  They will remain awhile, but a short time
the letters will vanish away.  Set it up for your use.  But contrarily, if
you will,
"That invisible letters after sometime, shall become visible."
And show themselves.  I will give you some examples, that you may invent
more thereby yourself.  If you write with juice of Citrons or Oranges, on
Copper or Brass, and leave this so for twenty days, the letters will appear
green upon the places.  The same may be done many other ways, namely by
dissolving Salt Ammoniac in water, and writing with it upon Brass, the place
will sooner appear of Verdigrease color.

Chapter X
"How we may take off letters that are written upon the paper."
If we would take letters from off the paper, or that such as are blotted out
might appear again, we must use this art.  As, if we would,
"Take letters off the paper,"
Or from parchment.  Take Aqua fortis, that is it that parts Gold from
Silver.  With a pencil wipe some of this upon the letters, it will presently
wipe off letters, written with Gall and Copras.  Or rub it with Salt Alkali
and Sulphur, making little balls of them, and that will eat them out, that
nothing shall be seen.  But if you desire to write anything in the place you
have made clean.  First, wet the place with water, wherein Alom is
dissolved, for the ink will not run about.  If you desire,
"To renew letters decayed,"
Or to read as are vanished.  Boil Galls in Wine, and with a Sponge wipe over
the letters.  The letters will presently be seen, when they are once wet
thus, and be well colored as they were at first.
Chapter XI
"How to counterfeit a Seal and writing."
It may be of great use when places are besieged, and in armies, and affairs
of great men, to know how to open letters, that are sealed with the
General's Seal, and signed with his name.  To know what is contained within,
and to seal them again.  Writing others that are contrary to them, and the
like. I will show how,
"To counterfeit the Seal."
Melt Sulphur, and cast it into powder of Ceruse, while it is melted.  Put
this mixture upon the Seal, but fence it about with paper or Wax, or Chalk,
and press it down.  When it is cold, take it off, and in that shall you have
the print of the Seal.  I will do it another way.  Fill an earthen pot with
Vinegar.  Cast Vitriol into it, and a good deal of Verdigrease.  Let it
bubble on the fire, put plates of Iron to it.  After a short time take them
out, and from the outside with you knife, scrape off a knife of rust it has
contracted, that is dirty as it were.  And put this into a dish under it.
Again, put them into the earthen pot, and scrape more off when you take them
out.  Do this so often, till you have some quantity of this dirty substance.
Cast Quicksilver into this, and make a mixture.  And while it is soft and
tender, lay it on the Seal and press it down.  And let it remain in the open
air, for it will grow so hard, that you may almost seal with it.  For it
will become even like to a metal.  It may be also done another way.  Take
the filings of Steel, and put them in an earthen Crucible at a strong fire.
Put such things to it, as will hasten the melting of it.  When it is melted,
cast it into some hollow place, pound it with a Brass Mortar, or it will be
easily done.  Do it so three or four times.  Then powder it, and mingle
Quicksilver with it, and let it boil in a glazed vessel six hours, till it
is well mingled.  Then press the Seal upon it, and let it cool, and it will
become exceeding hard.  It is possible,
"To make a great Seal less,"
If it should happen that we want a letter Seal, we must do thus.  Take
Isinglass, and dissolve it in water.  Anoint the figure with Oil, that it
may not stick to the glue.  Compass the Seal about with Wax, that the matter
run not about.  Put the Isinglass to the fire, and melt it, pour it upon the
Seal.  After three hours, when it is cold, take it away, and let it dry.
For the Seal when it is dry, will be drawn less equally.  If you will,
"Imitate the form of a writing,"
Do thus.  Open the letter upon a Looking-glass, that wants the foil.  Upon
the letter lay white paper, and a light under the glass.  Temper your ink as
the writing is, and draw your lines upon the lines of the letters you see
through.  We may,
"Open letters, and shut them without suspicion."
We use to seal letters, putting paper upon them, which goes through the
letter on one side, and Wax is put on the other side, where it comes forth,
and there it is sealed.  You shall open the letter thus:  Break away that
part of the paper, that is put upon the place, where is passes through the
letter, and the hole is, the letter opens presently.  Read it, and shut it
again, and put the paper torn off, in its proper place.  First, anointing
the crack with Gum Traganth, dissolved in water.  For the paper will be so
glued, that it will be stronger there then elsewhere.  Press it with a small
weight, till it grows dry.  The fraud cannot be discovered, because the glue
is white, and is not known from the color of the paper.

Chapter XII
"How you may speak at a great distance."
There are many ways how we may speak at a very great distance, with our
friends that are absent, or when they are in prison, or shut up in cities.
And this is done with safety, and without suspicion, as I shall show.  Two
things are declared here, either to do it by open voice reduplicated, or
else by a Trunk.  We may,
"With open voice show some things to those that are confederate with us."
It is wonderful, that as the light, so the voice is reverberated with equal
angles.  I shall show how this may be done by a glass.  It is almost grown
common, how to speak through right or circular walls.  The voice passing
from the mouth goes through the air.  If it goes about a wall that is
uniform, it passes uncorrupted.  But if it be at liberty, it is beaten back
by the wall it meets with in the way, and is heard, as we see in an echo.  I
through a circular building, that was very long and smooth, spoke words to
my friend, that heard them round the wall, and the words came entire to his
ears.  But one standing in the middle heard not any noise, and yet I heard
again what my friend answered to me.  In the morning when as I walked by the
sea shore, I heard above a mile, what my friends talked in a boat.  The sea
was very calm, and scarce moved, and the words came clearly to me, carried
on the plain superficies of the water.  I hear that at Mantua, and other
places, a great gallery is built, wherein one speaking in the corner, is
heard by another that knows the business, standing in another corner.  But
those that stand in the middle, perceive nothing of it.  But more exactly
and clearly,
"To signify to friends all things by a Trunk,"
Let the pipe be of earth (but Lead is better) or of any matter well closed,
that the voice may not get forth in the long passage.  For whatever you
speak at one end, the voice without any difference, as it came forth of the
speakers mouth, comes so to the ears of him that harkens.  And I doubt not
but this may be dome some miles off.  The voice not divided or scattered,
goes whole a long way.  I have tried it for above two hundred paces, when I
had no other convenience, and the words were heard so clear, and open, as
the speaker uttered them.  Upon this it came into my mind, to intercept
words spoken by the way, with leaden pipes, and to hold them so long as I
pleased close in.  That when I opened the hole, the words should break
forth.  I perceive that the sound goes by degrees, and that being carried
through a pipe, it may be shut up in the middle.  And if a very long Trunk
should take away the convenience of it, that many winding pipes might shut
it up in a close place.  I read that Albertus made an artificial head, that
spoke at set times.  I might hope to do the same by this invention.  Yet I
never tried this farther then I have said.  Yet i have heard by my friends,
that lovers have spoke a long time through a leaden pipe, from their houses
that stood far asunder.

Chapter XIII
"By night we may make signs by fire, and with dust by day."
It remains to show whether we can make signs in the night by fire, and in
the day by dust, to declare our business.  This may fall out two ways.  For
by fire of a sudden, we show to our confederate friends, or when we please,
by certain numbers of torches, we represent letters fit to demonstrate what
our purpose is.  That those that are far off, seeing and observing the
motions may perceive our intent.  The first way, we read that Medea promised
the Argonauts, that if she killed Pelias, she would signify so much to them
by night with fire from a watch tower, and by day with smoke.  When
therefore the business was effected, as she would have it, she
counterfeited, that she must pay her vows to the Moon, by making a fire, by
lighting torches in the open air, from the top of the place, as she had
promised.  And when the Argonauts understood it this way, they invaded the
King's palace, and killing the guard, they made her to enjoy her wishes.  We
read also that Maga, having possession of Paretonium, agreed with the watch,
that at night in the evening, and again in the morning betimes, they should
set up the light that was for confederacy.  And by that means signs were
made, that the messengers came as far as Clius.  Also to friends that live
out of the city, by fire we may figure out revenue, and the quality of
provision.  It is apparent, that Hannibal, as Polybius writes, when the
people of Agrigentum were besieged by the Romans, by many and frequent fires
by night, did show forth the intolerable famine of his army, and for that
cause many of his Soldier, for want of victuals, fell off to the enemy.
Also the Grecians compacted with Sinon, that by night, when the Trojans were
asleep, those that came to Troy should have a token, when he should open the
Trojan Horse, to let forth the Soldier that were within.  Whence Virgil,
"When Kings fleet lift up the flames, just then
Did Sinon let forth all the Grecian men."
Also by torches letters may be signified, as we find it in the manuscript of
Polybius.  tops of buildings or towers, are very fit to set up the torches
on.  Let the letters be divided into two or three parts, if there may be
eleven, or seven parts of each.  If they be seven, the first letters are
shown by single torches, the second by double ones, the third by three
torches.  The number may be also divided into four parts.  But in
representing them, we must observe the variety of motion.  For one torch
once lifted up, shall signify A, the same lifted up twice B, thrice C.  So
seven times.  The last of the first order G, after that two once H, so many
twice I, thrice signifies L, and so the rest of the same order.  Then Q by
the third order, once, R, by the same, twice, and thrice as many of the
same, signifies S.  And so it holds for four.  Thus a woman from a watch
tower, with three lights showed five times, then with double ones twice,
then with treble lights twice.  Then again with one at once, and with the
same four times, then five times with three lights, then thrice.  And with
as many four times, shall signify, vir adeft, "the man his come."  Also the
lights may be of diverse colors, if they would show that friends are near.
Also by smoke, we may show that our enemies are near, or some other thing.
Hence it was, that by the policy of Amilcar, the men of Agrigentum, being
drawn off far from the city, among their enemies that they pursued, unto an
Ambuscado, where the enemy lay hid, and a by wood set on fire, suffered a
great overthrow.  For when they were called back by their friends, by reason
of a smoke they supposed to come from the walls.  When they turned their
course to go to the city, Amilcar commanding, the Carthaginians followed
them, who fled before, and so slew them.

The End of The Sixteenth Book of Natural Magick






 

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