•••• 



D 



E 



G 



H 





• ••. 







%• 



• •• 



^••: 



M 



A^ 







Fig. 1 Specimen 29-2. A, spermatogonia! group with 24 chromosomes; 

 B, C, D, early growth period, showing two or three black staining bodies; E, F, G, 

 H, I, J, K, early prophases, demonstrating that the unequal pair arises from the 

 dark staining nucleolus; L, M, first spermatocyte, polar view, showing 14 chromo- 

 somes; A'', 0, first spermatocytes with 13 and 12 chromosomes respectively. 



561 



