. The standard cyclopedia of modern agriculture and rural economy, by the most distinguished authorities and specialists under the editorship of Professor R. Patrick Wright ... r of small shedding is used largely as temporaryshelter for young lambs in the lambing yardand when first taken from the yard. It is veryeasy to set up, and on the whole economical touse. [w. J. M.] Caoutchouc, Indiarubber, or simplyRubber, may be defined as an inspissated milkyjuice (latex) obtained through tapping (by in-cisions made in the baric) certain tropical trees,shrubs, or climbers. It consists o
. The standard cyclopedia of modern agriculture and rural economy, by the most distinguished authorities and specialists under the editorship of Professor R. Patrick Wright ... r of small shedding is used largely as temporaryshelter for young lambs in the lambing yardand when first taken from the yard. It is veryeasy to set up, and on the whole economical touse. [w. J. M.] Caoutchouc, Indiarubber, or simplyRubber, may be defined as an inspissated milkyjuice (latex) obtained through tapping (by in-cisions made in the baric) certain tropical trees,shrubs, or climbers. It consists of the corpusclesof a hydrocarbon floating in a fluid which con-tains in addition albumen and other undesirableingredients. The process of purification consistsin what is called the coagulation of the albumen,which thus carries with it certain of the im-purities, and prepares the way for the subsequentagglutination of the hydrocarbon. Hence caout-chouc may be spoken of as the chemical termfor the hydrocarbon, but it is also popularlyused to denote the purified commercial product,while indiarubber is the impure article. Gutta-percha differs almost exclusively in being in-. Caoutchouc 89 elastic and in its softening at low temperatures;it becomes plastic in hot water, and retains oncooling the form then given to it. Caoutchoucis distinctly elastic, is lighter than water, hasneither taste nor smell, is fusible at about248° F., and inflammable at higher tempera-tures. Botanically, indiarubber is obtained fromthree groups of plants, placed in the Euphor-biacese, in the Urticacese, and in the Apocynacese,while gutta percha, is derived almost exclusivelyfrom plants which belong to the are thus no botanical affinities in theplants that afford these products, and hardlyany other resemblances than that they are oneand all milk-giving plants found in tropicalcountries. The commercial article may be said to con-sist chemically of two ingredients—an elasticmaterial, on wh
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