4 The Unity of the Organism 



(a) Illustrated by the Ontogeny of Mammalian Sperm 



Without exception, so far as I know, positive description 

 of spermatogenesis affirms that the tail is produced from 



h.c. 



ra.p.-- 



FIGURE 36. SPERM OF FUR SEAL (AFTER OLIVER). 



h.c., head cap. n'k., neck, c.p., connecting piece, c.r., cytoplasmic 

 remnant, g.a., anterior granules, g.p., posterior granules, an., 

 annulus. m.p., main piece, e.p., end piece. 



other parts of the spermatid than the nucleus. For the lit- 

 tle we can do in the way of giving objectivity to this general 

 statement we will first examine the nearly mature, typical 



