PLATE 2 
EXPLANATION OF FIGURES 
7 Second polar division in metaphase, with first polar body attempting to 
divide. 
8 Nucleus of unfertilized egg in semiresting stage. Divided first polar 
body and the second polar body near periphery. (Two sections.) 
9 Female pronucleus of a fertilized egg. Second and one of the first polar 
bodies near the periphery. Sperm head in the interior of the egg. (Two sec- 
tions. ) 
10 Union of pronuclei (some chromosomes missing). 
11 Fertilization nucleus with twenty-two chromosomes. 
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