SPERM FILTRATES AND DIALYZATES. 



319 



TABLE III. 



A COMPARISON OF THE ACTION OF FILTRATES PREPARED FROM HEATED AND FROM 



UNHEATED SPERM SUSPENSIONS OF Arbacia FILTERED 



DIRECTLY THROUGH MANDLER FILTERS. 



Nor. normal undivided ova. 



Abn. undivided ova, abnormal in shape and in the appearance of cytoplasm 



and nucleus. 

 Cyt. cytolyzed. (Partial or complete division precedes cytolysis.) 



TABLE IV. 



A COMPARISON OF THE ACTION OF HEATED AND UNHEATED SPERM FILTRATES ON 

 OVA OF THE SAME SPECIES Arbacia punctulata. 



Nor. undivided and normal. 

 Div. divided. 

 Cyt. cytolyzed. 



b. Strongylocentrotus purpuratus and Strongylocentrotus francis- 

 canus. The same methods employed with two other species of 

 sea-urchins Strongylocentrotus purpuratus and Strongylocentrotus 



