SPERM FILTRATES AND DIALYZATES. 



313 



females are about equally susceptible, and nitrates or dialyzates 

 prepared in the same manner are equally effective on ova of the 

 same individual, as indicated in graphs IV. and V. 



LjL 





<] |0 U 13. 13 It IS It 17 IS I' 



GRAPH III. The percentage of ova divided and cytolyzed in sperm dialyzates 

 of the same species Arbacia punctulata. A = the average of three experiments 

 with dialyzates from 50 per cent, suspensions. Duration of dialysis = ten hours. 

 B = the average of three experiments with sea-water dialyzed for ten hours against 

 sea-water. = percentage in dialyzates in individual experiments. 



It is apparent that, if the eggs are in the same physiological 

 condition and are exposed at the same temperature to filtrates 

 of equal strength, one may expect equal amounts of segmentation 

 and cytolysis in approximately equal lengths of time. 



As might be expected a definite correlation exists between the 

 strength of the test solutions and the percentage of eggs affected 

 in a given time. This is well illustrated in graphs VI., VII., 

 VIII., and IX. 



The definite correlation which exists between the duration of 



