Abstract
1. Directions for the cultivation of hydra are given.2. The phenomenon of depression, in which there is a shortening and gradual loss of tentacles and column from the distal end proximally, is of common occurrence in hydras and probably represents a lowered metabolic state. It is induced by rich feeding, high temperature, sensescence, fouling of the culture water, lack of oxygen, transfer to clean fresh water. Recovery may be spontaneous or may by induced.3. Irregular adventitious budding tends to occur in senescent, extremely elongated, depressed, and sexual specimens, that is, specimens in a low metabolic state. Under such conditions buds may be retained on the parent far beyond the normal time, giving rise to so-called colonies.4. Abnormalities, such as forked tentacles and forked distal and basal ends arise chiefly in recovery after depression. Forked distal structures may also arise by retention of a bud.5. Longitudinal and transverse fission are probably not normal modes of reproduction of hydra but...
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