Artificial Parthenogenesis in Starfish Eggs 



393 



The time of early maturation (before the separation of the first 

 polar body), is apparently a critical period for the production of this 

 type of parthenogenetic development. The same has been found 

 true by Deiage.^^ 



A similar series of experiments on July 24, 1907, with the three 

 temperatures 35°, 36° and 37° and a somewhat different range of 

 exposures gave in general the same result, summarized in Table 

 III. 



TABLE III 



July 24, 1()0'J. Eggs were removed at 2:1^ p.m., and treated as follows 



" Delage: he. cit. 



