PLATE 2 



EXPLANATION OF FIGURES 

 OOGENESIS 



21 Oogonial metaphase {G. C). 



22 Oogonial resting stage {F-u). 



23 Leptotene stage (F-u). 



24 Transition stage (synapsis) not showing contraction figure (F-u). 



25 Transition stage (synapsis) showing contraction or synizeisis (F-u). 



26 and 27 Pachytene stages. 



28 Strepsitene stage (F-u). 



29 Diffuse stage (F-u). 



30 Early prophase (B). 



31 a and b. Late prophase showing 21 chromosomes. (Two successive sec- 

 tions of same nucleus) (F). 



32 a, b. First oocyte anaphase. Daughter plates from one spindle and 

 each showing 21 chromosomes (G. C). 



33 a, b. First oocyte metaphase, side view. (Two successive sections from 

 same nucleus and some chromosomes are not figured) (B). 



34 First oocyte metaphase, side view. (A portion of a plate to show divid- 

 ing microsome) (//). 



3.5 Second oocvte metaphase showing 21 chromosomes (H). 



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