tterfly when flying. Spread some thick clean gum-water on another
piece of paper, press it on the wings, and it will take them up; lay a
piece of white paper over it, and rub it gently with your finger, or
the smooth handle of a knife. The bodies are to be drawn in the space
which you leave between the wings.

_To soften Horn._

To one pound of wood-ashes, add two pounds of quick lime; put them
into a quart of water. Let the whole boil till reduced to one-third.
Then dip a feather in, and if, on drawing it out, the plume should
come off, it is a proof that it is boiled enough; if not, let it boil
a little longer. When it is settled, filter it off, and in the liquor
thus strained put in shavings of horn. Let them soak for three days;
and, first anointing your hands with oil, work the horn into a mass,
and print or mould it into any shape you please.

_To make Moulds of Horn._

If you wish to take the impression of any coin, medal, &c., previously
anoint it with oil; then lay the horn shavings over it in its softened
state. When dry, the impression will be sunk into the horn; and this
will serve as a mould to re-produce, either by plaster-of-paris, putty
and glue, or isinglass and ground egg-shells, the exact resemblance of
the coin or medal.

_To cast Figures in Imitation of Ivory._

Make isinglass and strong brandy into a paste, with powder of
egg-shells, very finely ground. You may give it what colour you
please; but cast it warm into your mould, which you previously oil
over. Leave the figure in the mould till dry, and you will find, on
taking it out, that it bears a very strong resemblance to ivory.

_To extract the Silver out of a Ring that is thick gilded, so that the
Gold may remain entire._

Take a silver ring that is thick gilded. Make a little hole through
the gold into the silver; then put the ring into aqua fortis, in a
warm place: it will dissolve the silver, and the gold will remain
whole.

_To soften Iron or Steel._

Either of the following simple methods will make iron or steel as soft
as lead:

1. Anoint it all over with tallow; temper it in a gentle charcoal
fire, and let it cool of itself.

2. Take a little clay, cover your iron with it, temper it in a
charcoal fire.

3. When the iron or steel is red-hot, strew hellebore on it.

4. Quench the iron or steel in the juice or water of common beans.

_To take a Plaster-of-Paris Cast from a Person's Face._

The person must l