540 P. W. WHITING 



the latter vary so much, both in size and in staining reaction, 

 that I have been unable thus far to reach any decision regarding 

 their character. 



In one ovary two cells in late prophase were found which had 

 the chromosomes split longitudinally. The small pair from one 

 cell with each member split is shown in figure 100. The three 

 pairs from the other cell are given in figure 101. This condition 

 seems to indicate the double nature of each of these chromosomes 

 at this stage, although the separation of the elements is probably 

 the result of technique. 



Figures 102 and 103 show metaphases in stage A. In the 

 latter cell were counted as many as eight diffuse bodies, resem- 

 bling the larger nucleolus, but distributed about in the cytoplasm 

 near the chromosomes. In figure 104 the chromosomes are 

 beginning to assume the parallel arrangement of stage B shown 

 in polar view by figure 105. An equatorial view of the same 

 stage along the parallel axis is shown in figure 106. 



Figure 107 shows an early, and figure 108 a later anaphase, 

 from two sections. The separate elements are not distinguish- 

 able at pole a of figure 108, but pole b shows six V-shaped chromo- 

 somes lying parallel to each other. Figure 109 is an anaphase 

 with the members of the pair to the right fused. The chromo- 

 somes are approximately parallel, showing that they have been 

 pulled out from the parallel arrangement of the metaphase plate. 

 In figure 110 the chromosomes are crowded at pole a, separate 

 and parallel at pole b. Figures 107, 108, 109, and 110 are from 

 picro-formol-acetic fixation, which accounts for the fusion and 

 the contraction of the chromosomes. Figure 111 shows an 

 oblique view of an anaphase from two sections. An optical 

 section is drawn at pole a, while the six chromosomes are shown 

 entire at pole 6. 



Figures 98 to 106 are ovogonial; figures 107 and 111 are 

 follicular; while the nature of the tissue from which figures 108, 

 109, and 110 were drawn is doubtful. 



