Ingestion of Colloidal Material and Water by Goldfishi

TonE concerned with a series of studies on group physiology, with particular reference to aspects of the general sociology of nonhuman animals. In addition to joint research reports, summaries of progress and of closely related literature have been published from time to time (e.g., Allee, 1931, 1938, 1947). Considerable attention has been given to changes that animals produce upon the environment in which they live and to the effects of such a conditioned environment upon later inhabitants. Within limits, the common goldfish (Carassius auratus) grow faster in reproducible artificial pond water, conditioned by placing other animals therein, than in unconditioned water. In part the