For this purpose prepare the black color with gall in such a way, that a drop will spread out on the size to a spot of about 5-1/2 inches in diameter, then add an equal quantity of sprinkling water, dip a large broom-corn whisk or a bristle-brush into the color and throw it by beating on a board upon the size which has been cleaned off by a strip of paper. The color appears on the size a gray color with white veins, from which the edge can be taken. THE BLUE MARBLE. To produce this use the following colors; black, orange or citron yellow, Indian red with a little black and Oriental blue, finally adding gall water and the body color. This ground color consists of 1 part Indigo and 1 part sprinkling water. THE BROWN MARBLE. This marble is one of the most common, but if the colors are well selected as given in the following paragraph it will give a fine effect. Black first, Havana brown second, chamois third, gall water, and, as ground color, humin-brown with a little carmine lake and one part sprinkling water. THE GRAY MARBLE. To produce this the following colors are necessary, black, dark purple, light bluish green, gall-water and a mixture of black with sprinkling water, by which the ground shade, gray, is obtained. A lighter or darker gray is obtained by adding more or less sprinkling water to the ground color. THE OLIVE-GRAY MARBLE. This marble has a very beautiful effect although in producing it but three colors are used. It belongs to the so called large-veined marbles and forms an olive grayish ground with a fine net of veins of black, dark-brown and white. It is produced in the following way; first black is put on with the brush, then brown is squirted on by the aid of a broom-corn whisk and then gall water and finally the body color is added. The body color consists of 2 parts black, 1 part green and the necessary sprinkling-water. If the shade of the body color is too deep, some pure water is added. For producing large veined marbles, the brush must be well filled with color, so that in throwing on of the color quite large drops will fall. THE BLACK MARBLE. It was formerly an unknown thing to produce a black marble over which a net of light-colored veins was stretched. My investigations have resulted in my becoming able to produce this brilliant and effective marble.