GENERAL SKETCH 



133 



E ^ 



Fig. 65. - Fertilization of the egg of Ascaris megalocepkala, var. bivaleus. [BOVERI.] (tor 

 later stages see Fig. 104.) 



A. The spermatozoon has entered the egg, its nucleus is shown a. c?; ^''^^f^ '"^^I'^^J-^^Z^ 

 lar mass of '■ archoplasm" (attraction-sphere) ; above are the clos.ng phase n the ^ -» "J ° 

 the second polar body (two chromosomes in each nucleus). B. ^^''^-''f'^'i^'J^^^:^^^^^ 

 lar stage ; the attraction-sphere (a) contains the dividmg centrosome. C. '-^'^'^^;'''^'; '^^^^^^l 

 in the ^e m-nuclei; the centrosome divided. D. Each germ-nucleus resolved mto t^vo chromo 

 so nesT attraction-;phere (.) double. E. Mitot.c figure forming for the ^rst cleavage ^he chro- 

 mosomes (.) alreadv split. /••. First cleavage in progress, showmg divergence of the daughter 

 chromosomes towards the spindle-poles (only three chromosomes shown). 



