44 



RALPH S. LILLIE 



TABLE 8 



The eggs were placed at about the time of separation of the first polar body in sea- 

 water at 35° for seventy seconds, and then returned to sea-water at ca. 20°. Ten 

 minutes later they were placed in the following solutions where they remained thirty 

 minutes; thence again to sea-water. The proportions of mature eggs forming larvae 

 were approximately as follows: 



Controls showed a good proportion of normal eggs; on June 21 many eggs 

 failed to maturate; on June 24 the proportion of fertilized eggs yielding larvae 

 was smaller than usual. 



Eggs from each lot were subjected to the same treatment after maturation 

 was complete (3^ to 4 hours after removal) ; the results of these experiments were 

 almost entirely negative. After maturation the eggs become relatively irre- 

 sponsive to this form of treatment.-^ 



TABLE 9 



The eggs were warmed briefly to 35° as already described, and exposed for thirty min- 

 utes to the folloivinj solutions 



Both sets of controls were normal. 



2^ Journal of Experimental Zoology, 1908, vol. 5, pp. 400 seq. 



