Abstract
Abstract Accessory to a comprehensive study of guayule production now under way by the United States Department of Agriculture is an analysis of the rubber content of plants of various strains and ages grown under diverse environmental conditions. This analysis is currently made by chemical extraction of the rubber from finely ground tissues by a method based on that described by Spence and Caldwell. This method consists of a number of distinct steps, and it is part of the program to test possible variants of these steps. As a check on the effectiveness of such tentative modifications, the ground samples are examined microscopically, especially the spent charges remaining after extraction.
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