92 EDWIN G. CONKLIN 
Fig. 7 2-cell stage of C. plana. The nuclei just before the second cleavage are 
24u in diameter. 
Fig. 8 12-cell stage of C. plana. The nuclei in the first quartet of micromeres, 
la-1d, three of which are dividing, are 14u in diameter at their maximum size. 
Fig.9 Chromosomes from four different spindles of the second cleavage, all 
in the metaphase and all magnified 2000 diameters. 
Fig. 10 Chromosomes from four different spindles of the cells la—1d, all in the 
metaphase and all magnified 2000 diameters. 
Fig. 11 Egg centrifuged ten minutes after formation of first polar body and 
during formation of second; fixed three hours after centrifuging. Telophase of 
second maturation division; indication of formation of enormous second polar 
body. The size of nuclei is dependent upon quantity of cytoplasm in which they 
lie. 
Fig. 12 Centrifuged fifteen minutes in gum arabic, fixed three hours later. 
Evidently centrifuged during first cleavage; almost all of the cytoplasm is in the 
smaller cell. The size of the nuclei is proportional to the quantity of cytoplasm. 
