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1 DEPARTMENT OF ZOÖLOGY AND ENTOMOLOGY, IOWA STATE COLLEGE, AMES, IOWA
1. It is concluded that longitudinal division in Hydra is not a reproductive process but is one of regeneration.
2. Longitudinal division is stimulated by the tearing of the hydra's mouth.
3. About 17 per cent of those animals torn undergo division; the remainder merely heal the cut.
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