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ROBERT T. HANCE 



ber of chromosomes in the first and second spermatocytes, 

 and the secondary reduction phenomena in the second sperma- 

 tocytes, were influenced by the same conditions which affected 

 the number of spermatogonia! chromosomes. The first spermato- 

 cyte cells that I have counted have had twenty chromosomes, 

 and the secondary spermatocytes — although I have not found 



Text fig. 5 A diagrammatic comparison of the amounts of chromatin in pig 

 spermatogonia studied by Wodsedalek and myself. The metaphase plate to the 

 left shows forty chromosomes (X 3400), the column next to it represents the 

 total length of the chromosomes and average width or diameter of the spermato- 

 gonial cells. The column and chromosome group (showing presumably eighteen 

 chromosomes (X 3495) ) to the right illustrates the same features for the sperma- 

 togonial figure published by Wodsedalek. It is evident that the pillar to the 

 left is about twice as high and one half as wide as the one to the left, both 

 consequently possessing the same area. See text. 



