“For low priced articles, I sometimes combine caoutchouc and sulphur with vegetable or Stockholm pitch; and when spread into sheets or made up into other forms, I vulcanize the compound. The proportions may be varied very considerably, as well as the temperatures at which they are vulcanized; but I find the following to answer well: 8 parts caoutchouc, 2 sulphur, 3 pitch; or 8 parts caoutchouc, 2 sulphur, 1 pitch, submitted to a temperature of 290° for an hour. To prevent blistering and porosity, if necessary, I employ pressure by means of screw cramps and plates, or otherwise, during the vulcanizing. This material is applicable to railway packing, and other rough uses. “I also combine and vulcanize in the same manner caoutchouc, sulphur, and resins, preferring on account of its cheapness the common resin of commerce. The proportions and temperature, as in the case of pitch, may be varied; but the following I find to be useful for many purposes: 16 parts caoutchouc, 2 parts sulphur, 6 parts resin; or 16 caoutchouc, 4 sulphur, 2 resin. These compounds may be submitted to the same treatment as in the case of pitch, and are applicable to similar uses. For some purposes, I also combine caoutchouc and sulphur with wood or cork dust, or fibrous substances, such as hemp and flax, or any other suitable material cut into short lengths, and vulcanize such compounds, either in blocks, or spread, or otherwise wrought into sheets, or formed into figures, or embossed, or ornamented as before described.” * * * * * The following account of “Parke’s Improvements in Dyeing” will be found to be very important: I will now proceed to describe another part of my invention, which consists in dyeing caoutchouc and gutta-percha alone, or in combination; and afterwards, when desired, treating those matters by changing agents, according to either of the methods herein described.