TAKING LEAF PHOTOGRAPHS—A very pretty amusement, especially for those who have just completed the study of botany, is the taking of leaf photographs. One very simple process is this: At any druggist's get an ounce of Bichromate of Potassium. Put this into a pint bottle of water. When the solution becomes saturated—that is, the water is dissolved as much as it will—pour off some of the clear liquid into a shallow dish; on this float a piece of ordinary writing paper till it is thoroughly moistened, let it dry in the dark. It should be a bright yellow. On this put the leaf, under a piece of black soft cloth and several sheets of newspaper. Put these between two pieces of glass (all the pieces should be of the same size) and with spring clothespins fasten them together. Expose to a bright sun, placing the leaf so that the rays will fall upon it as nearly perpendicular as possible. In a few moments it will begin to turn brown; but it requires from half an hour to several hours to produce a perfect print. When it has become dark enough, take it from the frame, and put it into clear water, which must be changed every few minutes until the yellow part becomes white. Sometimes the leaf veinings will be quite distinct. By following these directions it is scarcely possible to fail, and a little practice will make perfect.
CURIOUS THINGS.—1. To apparently burn water, fill a glass lamp with water, and put into it for a wick a piece of Gum Camphor. The lamp should not be quite full, and the camphor may be left to float upon the surface of the water. On touching a lighted match to the Camphor, up shoots a clear, steady flame, and seems to sink below the surface of the water, so that the flame is surrounded by the liquid. It will burn a long time. If the Camphor be ignited in a large dish of water it will commonly float about while burning.
2. To change the faces of a group to a livid, deathly whiteness, and to destroy colors, wet a half teacupful of common salt in Alcohol and burn it on a plate in a dark room. Let the salt soak a few minutes before igniting. The flame will deaden the brightest colors in the room, and the dresses of the company will seem to be changed. Let each one put his face behind the flame, and it will present a most ghastly spectacle to those who stand before it. This is serviceable in tableau where terror of death is to be represented. The change wrought by the flame, when the materials are properly prepared, is very surprising.
3. Wet a piece of thick wrapping paper, then dry near the stove. While dry, lay it down upon a varnished table or dry woolen cloth, and rub it briskly with a piece of India rubber. It will soon become electrified, and if tossed against the wall or the looking glass will stick some time. Tear tissue-paper into bits, one-eighth of an inch square, and this piece of electrified paper will draw them. Or take a tea-tray and put it on three tumblers. Lay the electric paper on it, and on touching the tray you will get a little spark. Let the paper lay on the tray, and on touching the tray again you will get another spark, but of the opposite kind of electricity. Replace the paper and you will get another, and so on.
4. To produce a spectrum, burn magnesium wire in a dark room, and as soon as the flame is extinguished, let each one try to look into the other's faces. The spectrum of the extinguished light is clearly seen.
MURIATE OF TIN. TIN LIQUOR.—If druggists keep it, it is best to purchase of them already made, but if you prefer, proceed as follows: Get at a tinner's shop block tin, put it into a shovel and melt it. After it is melted, pour it from the height of four or five feet into a pail of clear water. The object of this is to have the tin in small particles, so that the Acid can dissolve it. Take it out of the water and dry it; then put it in a strong brass bottle. Pour over it Muriatic Acid twelve ounces, then slowly add sulphuric acid eight ounces. The Acid should be added about a tablespoonful at a time, at intervals of five or eight minutes, for if you add it too rapidly you run the risk of breaking the bottle by heat. After you have all the Acid in, let the bottle stand until the ebullition subsides; then stop it up with beeswax or glass stopper, and set it away; and it will keep good for a year or more, or it will be fit for use in twenty-four hours.
THE CENTENNIAL ILLUMINATING OIL.—Recipe for Making One Gallon.—Take seven-eighths gallon Benzine or crude Petroleum, add to it one-half ounce Gum Camphor, one-half ounce Alcohol, one-half pint common Salt, one-half ounce Oil of Sassafras. Stir and mix it well for about five minutes. Let is stand for twenty-four hours and it is ready for use. It is better to buy the Benzine from Pittsburgh, Pa., as the druggists usually charge two or three times the wholesale price.
CHAPTER X.
COIN DEPARTMENT.