PLATE 3 



EXPLANATIOX OF FIGCllES 



36 First spermatocyte prophase, showing 13 bivalents, G or 7 univalents, 

 and one tripartite group (//). 



37 First spermatocyte metaphase (//). 



38 and 39 First spermatocyte anaphase, first phase (//). 



40, 41, and 42 First spermatocyte anaphase, second phase (//). 



43 First spermatocyte anaphase (fi. C). 



44 The long X-component ; a, as associated with the Y-chromosome on 

 spindle; a and b after Hermann's fluid; c, d, and e, after Gilson-Carnoy's fluid. 



45 Long X-com]>onent from second spermatocyte metaphase fC. ). 



46 Cleavage spindle showing diminution of chromatin. Fixed in alcohol- 

 acetic mixture. 



47 Cleavage spindle, no diminution of chromatin. Fixed in alcohol-acetic 

 mixture. 



48 Spermatozoon, axial view (F.). 



49 Spermatozoon, side view iF.). 



98 



