Abstract
When an immature egg of the worm Chaetopterus enters sea water, the protoplasm first undergoes a transient increase in viscosity, and then rapidly becomes more fluid than it was originally. These effects are believed to be due to a calcium-activated proteolytic enzyme which is also a clotting enzyme. In the course of the investigation, data were obtained as to the effect of temperature on the rate of germinal vesicle breakdown.
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