THE FERTILIZATION-PROCESS 



treated by some means to stimulate parthenogenetic devel- 

 opment. At fifteen minutes after removal from the animal, 

 every egg shows the first maturation spindle, its chromo- 

 somes at the metaphase firmly anchored by means of the 



oo 







ok^ is o o''°Q.'°o 0^6 o 



Fig. 27. — For descriptive legend see page 166. > 



^» 5/1 I L oS 



Spindle's outer pole to the egg-periphery. At any time after 

 dissolution of the germinal vesicle the egg is fertilizable. 

 'The egg before rupture of the germinal vesicle while in 

 the ovary is an irregular pear-shaped body whose upper 

 two-thirds are covered by a delicate vitelline membrane 



' ^6S 



