These marbles are in great use and are much liked on account of their rapid and easy production, especially when many books are to be marbled; they appear very elegant on account of their fineness. For hair marbles but one or two colors are employed which are diluted with water to 1/3 their volume. Add enough of gall to the first color so that in throwing the same on the size it will spread sufficiently to form a ribbon from 5 to 6 inches wide. Take a whisk and throw on the second color in drops that are not too large and as nearly as possible, equally distributed, then, with the bristle-brush, or sieve and brush throw sprinkling water on the colors. In this way hair veins are formed, showing more or less ground according to the quantity of sprinkling water thrown on. The size is produced for all hair-marbles alike. In the morning boil 3-1/5 ounces of carrageen moss in 7 quarts of water and after the boiling add 1 quart of cold water, stir the whole mixture several times and allow it to stand during the day until it is fully cooled off. In the evening the size must be again diluted by another quart of water and it is then filtered through a piece of linen and left to stand over night. The next day it is ready for use. This holds good during the summer months as the temperature of the air will just make the size useful for this purpose. During the winter months the size must be allowed to stand for 36 hours before use. BLACK HAIR MARBLE. To produce this variety of marble there is a screen or sieve necessary as well as a wide brush having stiff bristles. By adding gall from time to time, the black is made so expansive that a single drop will be spread out to a spot of about 8 inches in diameter. Dip the brush into sprinkling water, shake the brush well so that the superfluous water is thrown out, hold the sieve above the size and move the brush quickly and lightly over it. In this way the hair marble is finished and may be taken off. RED HAIR MARBLE. For this to be produced the best color is Indian or mineral red since all other chemical coloring substances which are bound to bodies will usually run, on strong compression, into hair veins. Only the excellent lakes of Munich will withstand this treatment, but the fineness of the veins leaves much to be desired, whereas Indian red answers every purpose. BLUE HAIR MARBLE. The mode of producing it is the same as applied in producing black hair-marble, but, instead of black, Indigo is used. Indigo is the only one among blue coloring matters that admits of the necessary expansion for the production of hair veins without running off or gathering into small lumps. RED AND BLACK HAIR MARBLE.