FERTILIZATION AND CLEAVAGE 



77 



In most instances the ova were fixed in Bouin's solution and 

 sectioned in order to determine the nuclear condition. The 



TABLE IX 



The Effect of Various Concentrations of Live Sperm upon Freshly 

 Ovulated Rabbit Ova. (From the Journal of Experimental Zoology) 



sectioned ova of the experiments listed in Table IX invari- 

 ably showed true polar bodies; no achromatic extrusions 

 were observed. Furthermore, all ova with two polar bodies 



