. La scienza popolare mensile. Ically riscaldando,in condizioni tali da separare la gomma dalla fibra. Appare evidente che ogni volta che la gomma esiste come tale all'interno della pianta, sia come risultato della coagulazione sia per qualsiasi altra ragione, per la sua estrazione devono essere ricordati altri meth-ods che quelli della maschiatura. La pratica nel caso delle gomme da radice suggerisce la comminuzione del 1 per un conto completo vedi F. E. Lloyd, guayule, una pianta di gomma del deserto di Orihuahuan, Carnegie Institution di Washington, Pubblicazione 139. Vol. Lxxxi.-22. 3»4 i tessuti MENSILI DELLA SCIENZA POPOLARE, ac

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. The Popular science monthly . ically by heating, under such conditions as to separate the rubber from the fiber. It willappear evident that whenever the rubber exists as such within the plant, either as the result of coagulation or for any other reason, other meth-ods than that of tapping must be resorted to for its extraction. Thepractise in the case of the root-rubbers suggest comminution of the 1 For a full account see F. E. Lloyd, Guayule, a Rubber Plant of theOrihuahuan Desert, Carnegie Institution of Washington, Publication 139. vol. lxxxi.-22. 3»4 THE POPULAR SCIENCE MONTHLY tissues, accompanied by the agglomeration of the contained rubber.The methods of the chemist have suggested extraction by the use ofsuitable solvents, the rubber being recovered by differential solution anddistillation of the solvents. Both these methods have been adapted tothe extraction of rubber from the plant which shall claim brief atten-tion in what follows. I refer to the guayvle, a low, gray or greenish-gray shrub (Figs. 1and 2).. Fig. 1. A large and unusually symmetrical Guayule Plant. of limited distribution within the Chihuahuan desert, having the centerof its geographical area very near to the northern boundary of the stateof Zaeatecas, Mexico. The southern extension of this area lies some-what below San Luis Potosi; to the north it is found in the Big Bendcountry of Texas; here are rather small amounts, and of low stature ascompared with the conditions farther to the south. The plant scarcelyinvades the state of Sonora, and is found only in the western part ofXuevo Leon. The chief interest attaching to its occurrence in Texas is the factthat it was here first discovered by Dr. J. M. Bigelow near Escondido(Hidden) Creek. The party of the Mexican Boundary Survey, ofwhich Bigelow was a member, in all probability rested at the largespring which forms the source of this creek, a camping-place for un-counted generations of Indians before the days of the white man.Here, on the McKe

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