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EGG AND SPERM SUBSTANCES 



Plate I. Agglutination of Luidia clathrata sperm by versene-egg water. 

 1, Sperm in sea water. 2, Sperm in 0.0025M versene, pH 8.1. 3, Sperm in 

 egg water. 4, Sperm in versene (0.0025M, pH 8.1) -egg water. 5, Spei-m 

 in versene-egg water. Agglutination appears to be strictly head to head. 

 (Phase contrast optics, 1-4, approximately 100 X; 5, approximately 430 X.) 



