2331. Fruit Skeletons
Fruits are divested of their pulp and made into skeletons in a different manner. Take, for an instance, a fine large pear which is soft, and not tough; let it be carefully pared without squeezing it, and without injuring either the crown or the stalk; put it into a pot of rain water, covered, set it over the fire, and let it boil gently till perfectly soft, then take it out and lay it in a dish filled with cold water; then holding it by the stalk with one hand, rub off as much of the pulp as you can with the finger and thumb, beginning at the stalk and rubbing it regularly towards the crown. The fibres are most tender towards the extremities, and are therefore to be treated with great care there. When the pulp has thus been cleared pretty well off, the point of a fine penknife may be of use to pick away the pulp sticking to the core. In order to see how the operation advances, the soiled water must be thrown away from time to time, and clean poured on in its place. When the pulp is in this manner perfectly separated, the clean skeleton is to be preserved in spirits of wine.
2332. To make Impressions of Leaves
Prepare two rubbers by tying up wool or any other substance in wash-leather; then prepare the colours in which you wish to print leaves, by rubbing up with cold drawn linseed oil the tints that are required, as indigo for blue, chrome for yellow, indigo and chrome for green, &c. Get a number of leaves the size and kind you wish to stamp, then dip the rubbers into the paint, and rub them one over the other, so that you may have but a small quantity of the composition upon the rubbers; place a leaf upon one rubber and moisten it gently with the other; take the leaf off and apply it to the substance on which you wish to make an imprint of the leaf. Upon the leaf place a piece of white paper, press gently, and a beautiful impression of all the veins of the leaf will be obtained.
2333. To make a Fac-simile of a Leaf in Copper
This beautiful experiment can be performed by any person in possession of a common galvanic battery. The process is as follows:
Soften a piece of gutta percha over a candle, or before a fire; knead it with the moist fingers upon a table, until the surface is perfectly smooth, and large enough to cover the leaf to be copied; lay the leaf flat upon the surface, and press every part well into the gutta-percha. In about five minutes the leaf may be removed, when, if the operation has been carefully performed, a perfect impression of the leaf will be made in the gutta percha.
This must now be attached to the wire in connection with the zinc end of the battery (which can easily be done by heating the end of the wire, and pressing it into the gutta percha), dusted well over with the best blacklead with a camel-hair brush—the object of which is to render it a conductor of electricity; it should then be completely immersed in a saturated solution of sulphate of copper. A piece of copper attached to the wire in connection with the copper end of the battery must also be inserted into the copper solution facing the gutta percha, but not touching it; this not only acts as a conductor to the electricity, but also maintains the solution of copper of a permanent strength.