182 Artificial Parthenogenesis and Fertilization 



Fig. 46 



Fig. 47 



Fig. 48 



Fig. 49 



Fig. 50 



Fig. 51 



Membrane formation and cytolysis of the sea-m'chin egg under the influence of 



saUcyl aldehyde. 



Figs. 46-49. — Successive stages in the formation of the membrane. 

 Fig. 50. — Beginning of cytolysis. 

 Fig. 51. — Complete cytolysis. 



