chr. 



Fig. 6a. — Diagram of ovum, showing 

 diffuse yolk-granules, g.v. germinal 

 vesicle or nucleus ; chr. chromosomes. 



Fig. 6b. 



-Diagram of body-cell, show- 



ing the nucleus with coil of chromatin 

 filaments and the surrounding cyto- 



plasm. (After Carnoy.) 



[Facing p. 38. 



