Take very fine flour, mix it with white of eggs, isinglass, and a little yeast; mingle the materials; beat them well together; spread them, the batter being made thin with gum-water, on even tin plates, and dry them in a stove, then cut them out for use. To color them, tinge the paste with Brazil, or vermilion for red; indigo or verditer, &c., for blue; saffron, turmeric, or gamboge, &c., for yellow. TO MAKE ISINGLASS GLUE. This is made by dissolving beaten isinglass in water by boiling, and having strained it through a coarse linen cloth, evaporating it again to such a consistence, that, being cold, the glue will be perfectly hard and dry. A great improvement is made in this glue by adding spirit of wine or brandy after it is strained, and then renewing the evaporation till it gains the due consistence. TO MAKE ISINGLASS SIZE. This may also be prepared in the manner above directed for the glue, by increasing the proportion of the water for dissolving it, and the same holds good of parchment size. A better sort of the common size may be likewise made by treating cuttings of glovers’ leather in the same manner. NEW WATER-PROOF CLOTH. According to a recent statement of M. Payen, a chemist of some note, cloth is rendered water-proof by the aid of alum and sugar of lead, without the aid of India-rubber or gutta-percha, or any other gums or oils. The process given is very simple, and is claimed to render any species of tissue water-proof. “Dissolve two pounds and a half of alum in four gallons of water; dissolve, also, in a separate vessel, the same weight of acetate of lead in the same quantity of water. When both are thoroughly dissolved mix the solutions together, and when the sulphate of lead, resulting from this mixture, has been precipitated to the bottom of the vessel in the form of a powder, pour off the solution, and plunge into it the tissue to be rendered water-proof. Wash and rub it well during a few minutes, and hang it in the air to dry.” When dry, the fabric or cloth so treated will repel rain and moisture, but allow the air or perspiration to pass through it. Immerse dry timber in a strong solution of alum, and dry it in a kiln, the warmer the better, and we will warrant it to be the best and cheapest substance for preserving wood from decay and burning. To those who are acquainted with the nature and effects of alum, they know what a great heat alumina can stand, and alum when deprived of its water by strong heat, does not easily combine with it again, by any common means. Therefore, the reasonableness of the foregoing statements. By washing wood with strong soap suds, allowing it to dry, and then washing it with a strong solution of alum, a most excellent water-proof coating is the result.