PLATE 6 



EXPLANATION OP FIGURES 



70 to 84 Second spermatocyte divisions 



70 to 72 Equatorial plates, no separated chromosome. Apparently more 

 than one-half as many chromosomes as in I spermatocyte, although counting is 

 impossible. 



73 to 77 Equatorial plates, with separated chromosomes, varying in number 

 and shape. 



78 and 79 Metaphase spindles, no possible X-chromosome. 



80 and 81 Metaphase spindles, with projecting arms toward lower pole. 



82 Metaphase spindle, one round separate chromosome toward lower pole. 



83 Anaphase, two separate chromosomes toward lower plate, one round and 

 one three-parted. 



84 Anaphase, no X-chromosome present. 



85 First spermatocyte equatorial plate. One of the few cells in the smear 

 preparations where it is possible to try to count chromosomes, the number might 

 be nine. 



86 to 91 Aceto-carmine preparations 



86 First spermatocyte equatorial plate, where there are apparently 6 chro- 

 mosomes. 



87 First spermatocyte equatorial plate, where there are apparently 7 chro- 

 mosomes. 



88 First spermatocyte equatorial plate, where there are apparently 8 chro- 

 mosomes. 



89 First spermatocyte equatorial plate, where there are apparently 9 chro- 

 mosomes. 



90 Second spermatocyte equatorial plate, where there are apparently 9 chro- 

 mosomes. 



91 First spermatocyte anaphase, where there are apparently 9 chromosomes 

 at each pole. 



82 



