. The Popular science monthly . congeners, mariola (Parthe- Fig. 5. Microscopic Appearance ofGuayule Rubber in the Cells of theRubber-bearing Tissue. THE GUAYULE 3*7 nium incanum) and tatanini (Parthenium lyratum) afford mater-ial to the hand of the ball enthusiast of northern Mexico. These twoplants, however, contain rubber in very meager quantity as comparedwith guayule. This method of extracting the rubber, viz., by mastication, very nat-urally suggested the course of manufacture. As early as 1888 it was. Fig. 6. Flowers of Guayule. proposed to extract the rubber by a process of grinding an
. The Popular science monthly . congeners, mariola (Parthe- Fig. 5. Microscopic Appearance ofGuayule Rubber in the Cells of theRubber-bearing Tissue. THE GUAYULE 3*7 nium incanum) and tatanini (Parthenium lyratum) afford mater-ial to the hand of the ball enthusiast of northern Mexico. These twoplants, however, contain rubber in very meager quantity as comparedwith guayule. This method of extracting the rubber, viz., by mastication, very nat-urally suggested the course of manufacture. As early as 1888 it was. Fig. 6. Flowers of Guayule. proposed to extract the rubber by a process of grinding and test carried out in New York by the interested company showed thatthe bark contained at least 18 per cent, rubber comparable to thebest grade of centrals. But nothing further was done and samplessent about this time from Mexico to Germany and England, found nofavor. In 1900, however, some Germans established a laboratory at SanLuis Potosi, the birthplace of the industry in Mexico. Two years later,as a result of the San Luis investigations, a factory was started atJimulco, in which a method of extraction by solvents was used. It wasat this time that the experimental operations carried on by Mr. Law-rence and leading to the practical solution of the mechanical method,culminated in the first commercial shipment of crude guayule rubber,extracted by mechanical means. This was the American and, indeed,most important contribution to the solution of the problem, and led, asabove stated, to the es
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