ARTIFICIAL PARTHENOGENESIS IN CUMINGIA. / 



The division of AB which follows leads to the 4-cel] stage repre- 

 sented in figure 25 and in text-figure I, 8, in which there are 

 three cells, A, B, and C, of about the same size and a larger 

 cell D. The size-relations of these cells are very constant in 

 normally fertilized eggs. The time-relations of the divisions 

 are less constant, as may be seen from the different phases of 

 the spindles in figures 18 to 24. In some cases AB and CD 



