'f^'-i-yl. 



^:, -'^ :-/ ^" 



, V»' 



Fig. 17 



Fig. 18 



Fig. 19 



Fig. 20 



Fig. 23 



Fig. 24 



Plate II. (From the Journal of Morphology) 



Figs. 17-22. Nuclei of ova from ovary of rat 20 days post partum. 17, Deuto- 

 broch nucleus. 18, Beginning of the formation of clumps shown in next figure. 

 19, Modified pachynema. 20, Later stage showing characters of diplonema. 21, Nu- 

 cleus toward the end of the growth period. 22, Final stage in twenty-day rat. 



Fig. 23. Nucleus in mature follicle from adult rat. Fig. 24. Nucleus from ripe 

 follicle from adult rat. 



13 



