PLATE 3 
EXPLANATION OF FIGURES 
17 Germinal vesicle of egg preparing for maturation.. The nucleolus is 
represented by only a few small fragments. Chromatin of the nuclear reticulum 
segregating into granules at the nodes of the net. > 1228. 
18 First maturation spindle forming outside the germinal vesicle. The chro- 
matin granules are arranging themselves along the fibers of the spindle or are 
escaping into the cytoplasm through the broken membrane. X 1228. 
19 Metaphase of the first maturation spindle, with the chromosomes splitting. 
Note the granules of chromatin in the cytoplasm in the region of the spindle. 
x 1900. 
20 Copulation nucleus, first cleavage spindle forming. Remains of one polar 
body present. This drawing is compiled from two sections. X 1900. 
21 Telophase of the second cleavage spindle. The section is cut somewhat 
obliquely. At the right end of the spindle all the chromosomes present in the 
spindle are shown (20 in number). Not all of the chromosomes are present in the 
left end of the spindle in this section, but are found in adjacent sections. X 1900 
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