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In fact, the "ficus primoides," the "castilloa elastica," the "cecropia peltats," the "collophora utilis," the "cameraria letifolia," and above all, the "syphonia elastica," which belong to different families, abound in the provinces of South America. And meanwhile, a rather singular thing, there was not a single one to be seen.
Sometimes it is morphine or the narcotic principle, that characterises the vegetable milk, as in some papaverous plants; sometimes it is caoutchouc, as in the hevea and the castilloa; sometimes albumen and caseum, as in the cow-tree. The hydrocyanic acid is peculiar to the group of rosaceo-amygdalaceae.
This extravasation takes place more especially when the trees have attained a great age, and the interior of the trunk begins to decay. The bark and alburnum crack; and thus is effected naturally, what the art of man performs for the purpose of collecting the milky juices of the hevea, the castilloa, and the caoutchouc fig-tree.
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