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2503. Mastic Cement. This is employed for making a superior coating to inside walls, but must not be confounded with the resin mastic. It is made by mixing twenty parts of well-washed and sifted sharp sand with two parts of litharge and one of freshly burned and slaked quicklime, in fine dry powder. This is made into a putty, by mixing with linseed oil. It sets in a few hours, having the appearance of light stone; and we mention it, as it may be frequently employed with advantage in repairing broken stone-work (as steps), by filling up the missing parts. The employment of Roman cement, plaster, &c., for masonry work, hardly comes within the limits of Domestic Manipulation. 2504. Cement for Leather and Cloth. An adhesive material for uniting the parts of boots and shoes, and for the seams of articles of clothing, may be made thus:--Take one pound of gutta-percha, four ounces of India rubber, two ounces of pitch, one ounce of shellac, two ounces of oil. The ingredients are to be melted together, and used hot.