FORM REGULATION IN CERIANTHUS. I I 



erative power is shown by differences both in rapidity and in 

 amount of regeneration. 



2. The size of the piece does not influence the rapidity or the 

 amount of regeneration, except in the latest stages. Since the 

 regenerative power is different at different levels, the minimal size 

 of a piece capable of regeneration also differs at different levels, 

 but inversely as the regenerative power. 



3. Rapidity and amount of regeneration increase and decrease 

 with the temperature. 



4. The assumption of a special regulatory mechanism is not 

 necessary for the explanation of form regulation in Cerianthus. 



HULL ZOOLOGICAL LABORATORY, 



UiNIVERSlTY OF CHICAGO, July, 1903. 



