158 THE TESTES, BY V. LA VALETTE ST. GEORGE. 



Whether the sperm cell be uni- or multi -nucleated, is a matter 

 of no consequence, since the multi-nucleated are only to be 

 regarded as the sum of several, the number of which corresponds 

 to the number of the nuclei, with a certain quantity of the 

 cell substance surrounding the nucleus. 



Fig. 185. 



Fig. 185. From the testes of the Mouse. 



Kolliker observes, " that the proof that the sperm cells play 

 no essential part in the formation of the tails of the spermatozoa 

 lies in the fact that very often many tails are formed in one 

 cell." Properly speaking, each sperm zooid is developed from 

 a special cell, but in these cases no separation takes place 

 between the cell substance of the several cells. 



Fig. 186. 



\ 



Fig. 186. Development of the spermatozoa of the Mole. 



From the above statement it appears that Kolliker admits 

 the tail to be developed in every instance from the nucleus. 



I must remark, however, that I have never seen nuclei with 

 projecting tails without cell substance, and that since I have 



