PLATE 9 
EXPLANATION OF FIGURES 
38 and 39 Two unusually small sperm nuclei with their asters, separating from 
the cones. From two eggs;compare the size of the entire sperm nucleus at this 
stage (fig. 11). History same as figs. 35 to 37. 
41 Two sperm nuclei of unequal size from the same egg. Compare size of cen- 
trosomes and asters. History: Centrifuged 7200 revolutions in thirty-six seconds, 
forty-four minutes after insemination; preserved ninety-two minutes after insemi- 
nation. Reconstruction of three sections. 
472 
