_Eighth._ I take boots, shoes, gaiters, overalls, and other articles as they are now ordinarily made of unsulphurized caoutchouc, and greatly improve the same in point of smoothness of texture, and capability of resisting variations of temperature by exposing them for from thirty to sixty minutes to the fumes of sulphur, in a close vessel, heated to a temperature of 210 to 250 degrees more or less, or immersing them for the same length of time in a bath of melted sulphur. In either case, in order to prevent the articles from sticking to one another, they should be done over with a paste made of French chalk, flour and water, and that paste allowed to dry before subjecting them to the action of the sulphur. Boots, shoes, and other articles made in whole, or in part of unsulphurized gutta-percha, may be treated in the same way, but I prefer incorporating the sulphur in the first instance with the gutta-percha, when it is in the state of solution, or in the plastic state, or in any of the other states of preparation and combination aforesaid. _Lastly._ I improve the shoes of horses by laying upon and securing to the upper part of the same, a sheet, or layer of sulphurized gutta-percha, or of sulphurized caoutchouc, or by making the same wholly of either of the said materials. In the former case, the sheet or layer of sulphurized gutta-percha, and sulphurized caoutchouc, may be either attached to the shoe by rivets, before it is applied to the foot, or it may be laid loosely between the shoe and foot when the horse is being shod, and be made fast by passing the shoe nails through it. It affords a soft and yet firm footing to the animal, and resists, without injury to its shape, very high degrees of heat and pressure. The following described patent was taken out by CHARLES HANCOCK, of Grosvenor Place, for “certain improvements in the manufacture of gutta-percha, and its application alone, and its combination with other substances.” Patent dated Jan. 12, 1846. In copying these patents our aim is to make perfectly plain and clear to all interested, certain chemical facts, compounds and the like, which produce desired results, and which have thus far been preserved, as profound secrets. For example, in selecting certain claims or descriptions in the Hancock Patent, we here describe the process of _making and applying varnishes to India-rubber shoes, etc._, which varnishes are perfectly sweet, “shutting in” all disagreeable odors, from sulphur and other combinations. These varnishes may be applied to leather or cloth, giving them a beautiful glossy exterior, also rendering them water-proof.