The second part of the invention consists in combining gutta-percha with burned clay, burned flint, broken articles of earthen ware and china, marble, Portland, Cornish, or other stones, crushed and sifted, likewise oxide of zinc, oxide of copper, hydrate of lime, oxalate of lime, and also a compound of lime slaked with oxalic acid dissolved in water; in preparing this compound, about three pounds of acid are used to each bushel of lime; the acid is first dissolved in a sufficient quantity of water for slaking that quantity of lime; and after the solution has been added to the lime, the product is well dried and sifted. Any one or more of these materials may be combined with gutta-percha, with or without other materials, so as to produce new compounds of gutta-percha, useful for moulding articles, or for making sheets, _suitable to be cut into soles for boots and shoes_, straps, bands and other articles. The above matters are to be ground very fine and sifted; and the gutta-percha may be combined therewith, by any convenient means; but the patentee prefers to lay the gutta-percha on a heated plate, and roll it into a sheet, then to sift the materials over the sheet, and fold and re-fold the same, and to repeat the rolling, folding and sifting of the materials, until the desired compound is produced; or he rolls the gutta-percha between two smooth heated rollers, then dusts on the powder and folds the sheets, and again and again rolls the same till the desired mixture is obtained. He further states that in place of using the “welding machine,” he can employ like means to those just described for combining the small pieces or shavings of gutta-percha into a mass. The compound of gutta-percha may, whilst still in a heated state, be moulded to any desired form, or rolled into sheets. When great _elasticity is required_, caoutchouc (India-rubber) is mixed with such compounds of gutta-percha. CHARLES HANCOCK, of Broughton, gentleman. For “certain improved preparations and compounds of gutta-percha, and certain improvements in the manufacture of articles and fabrics composed of gutta-percha alone, and in combination with other substances.” Patent, dated May 11, 1848; specification enrolled Nov. 11, 1848.