SEVERAL preparations of Canwubis indica (syn. sativa), diffei-ing in physiological activity and in the manner of application to t,be human subject, are familiar to the Eastern nations. Of these, .'' charas" is an Indian drug, and is regarded by the natives as the most potetit substance obtainable from the plant. I t is chiefly used in the Punjab, and consists essentially of the resinous exudation from the sterns? leaves, and flower heads of the unfertilised female plant.
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Wood et al. (1896) studied this question.