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EXPLANATION OF PLATES. 



Figures 1, 3, 3, 5, 8, 11 and 13 represent single sections, while the others 

 have been reconstructed from two or more sections. All the figures have been 

 drawn with the aid of an Abbe-Zeiss camera lucida and a Zeiss apochromatic 

 2-Qmm apert 1"30 homog. immers. objective, using for the figures magnified 

 560 diam. a Zeiss Compeois. Ocular 4, and for those magnified 1450 diam. a 

 Zeiss Compens. Ocular 6. 



Plate I. 



Figure 1. — Ovarian egg before the formation of the first polar spindle. Note 



difference in size and shape of the chromosomes. A portion of the nuclear 



membrane is still visible, x 1450. 

 Figure 2. — Egg in Graafian follicle, somewhat shrunken away from the zona 



pellucida, showing first polar spindle. Note difference in size and shape of 



chromosomes, x 560. 



