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. 



