THE FEMALE GENITAL ORGANS. 



351 



way that the pairs of rods derived from one set of daughter loops 

 pass to the one daughter cell, and those derived from the other set 

 to the second daughter cell. In this manner are formed the large 

 egg daughter cells (O. Hertwig) or oocytes of the second order, and 

 a smaller cell, the first polar body. From this it is seen that the 

 daughter cell still retains 12 pairs of rods. A second unequal division 

 immediately follows without a period of rest, but in this case the corn- 



Fig. 282. Schematic representation of the behavior of the chromatin during the 

 maturation of the ovum (from Ruckert, 94). Instead of 12 chromosomes we have drawn, 

 for the sake of simplicity, only four : a, a, a, First, and (b) second polar body. 



ponent parts of the pairs of rods are so divided that each separate 

 rod moves away from its fellow, although they both originated from 

 the same daughter loop. In this manner a cell of the third gen- 

 eration is formed, the oocyte of the third order, or mature ovum, 

 as well as a second polar body. The second division in the period 

 of maturation is peculiar in that here daughter chromosomes are 



