For the production of this marble, black and Indian red are taken. The black is first thrown upon the size as in black hair-vein marble, the red is then treated by adding gall until a drop thrown upon the black will spread to about 2 inches in diameter. The trial is made with a brush, but for the purpose of producing the marble a whisk is taken, by means of which the red is thrown upon the black in very small drops and close to each other. BLUISH-BROWN HAIR MARBLE. To produce this marble Indigo and Vandyke brown are taken. The Indigo is put on first then the Vandyke brown is thrown on by a whisk, and finally, the carpet of colors is forced into forming veins by sprinkling water, which is applied by aid of the brush and sieve. Rules in regard to the Marbling Table. RULES IN REGARD TO THE MARBLING TABLE. The table upon which marbling is to be executed must be firm and immovable. On it the utensils necessary to marbling are placed. The trough, colors, gall in a closed bottle with stopper pierced by a tube, a vessel with water, the comb, the size skimmer are all to be within easy reach. They should be placed about in the following order; in front, nearest to the workman and to the right, the trough, the receptacle for the waste color and board for skimming off the size to the left, beyond the trough the vessels in which the colors and gall are kept, behind the first vessels containing the colors the dish containing water, and alongside this the bottle containing gall and next to it the comb and stylus. On the left side of the trough there must be a sufficiently large space for the books to be marbled. PRECAUTIONS. Before closing the article on marbling, I will add a few words to the precautions to be observed while marbling. Before all else, see that the air in the room, where the marbling is to be done, is free of dust, as the falling dust, especially in drawn marbles will form many white spots, which spoil the effect of the marbling. Cleanliness should always be observed, as the beauty of the marbles and their rapid production depend on it. Protect the size from dust by a lid, which you place on the vessel, and have a large soft sponge ready to remove the superfluous size after each immersion of the book, by which a rapid drying is obtained and the moisture is prohibited from impregnating the book. SUPPLEMENTARY REMARKS. A NEW EXPANDING MEDIUM.