Abstract
THE rubber industry of to-day is concerned almost exclusively with the exudation which results from wounding certain of the tissues of Hevea brasiliensis, a large tree 80-100 ft. tall which is indigenous to the Amazon basin. The tree will grow almost anywhere in the belt 10 ° north and south of the equator, though it does not compete economically at elevations above 2,000 ft. Its translation from the Amazonian forests to plantations in the tropical Middle East is a romantic story associated with the names of Markham and Wickham.
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