Cement, Elas′tic

Prep. 1. Caoutchouc (in small pieces), 1 part; chloroform, 3 parts; di olve. 2. (Lenher.) Caoutchouc, 5 parts; chloroform, 3 parts; di olve, and add gum mastic (powdered), 1 part. Elastic and transparent. 3. Gutta perch a, 3 parts; caoutchouc, 1 part (both cut small); bisulphide of carbon, 8 parts; mix in a close ve el and di olve by the heat of a water bath. This is to be gently warmed before it is applied. 4. Gutta perch a, 1 lb.; caoutchouc, 4 oz.; pitch, 2 oz.; shell-lac, 1 oz.; linseed oil, 2 oz.; melted together. This must be melted before being applied. Obs. The cements 1 and 2 are elastic and transparent, and are applicable to many uses. The others, 3 and 4, are used for uniting leather, cloth, .