734 GENERATION AND DEVELOPMENT. 



A 



J k 



Fig. 206.* B 

 y 



n 



\ 



\ \y 



* Fig. 206. A, spermatic fila- 

 ments from the human vas deferens 

 (from Kolliker). I, magnified 350 

 diameters; 2, magnified 800 dia- 

 meters; , from the side; b, from 

 above. B, spermatic cells and 

 spermatozoa of the bull undergoing 

 development (from Kolliker) 4 ^. 

 I, spermatic cells, with one or two 

 nuclei, one of them clear ; 2, 3, free 

 nuclei, with spermatic filaments 

 forming ; 4, the filaments 'elongated 

 and the body widened ; 5, filaments 

 nearly fully developed. C, escape 

 of the spermatozoa from their cells 

 in the same animal. I, spermatic 

 cell containing the spermatozoon 

 coiled up within it ; 2, the cells elon- 

 gated by the partial uncoiling of the 

 spermatic filament; 3, a cell from 

 which the filament has in part be- 

 come free; 4, the same with the 

 body also partially free ; 5, sperma- 

 tozoon from the epididymis with vestiges of the cell adherent ; 6, sper- 

 matozoon from the vas deferens, showing the small enlargement, b, on 

 the filament. 



