80 



H. B. GOODRICH 



is joined to two pairs of fibers, one from each pole. This can 

 not often be determined from inspection of a single spindle but 

 compare figure 37 with figure 44, a, which two taken together 

 show the full complement of fibers. This condition is diagrammati- 

 cally illustrated by text figure A. Here two autosome bivalents 

 are stippled, two X-components and the unmated portion of 



\ 





Text figs. A, B and C Diagrams to illustrate the unequal mitosis; A is of the 

 metaphase, B of the 'first phase' 'and C of the 'second phase' of the separation 

 of the chromosomes (see text). Autosomes are stippled, the X-components 

 unmated by the Y-chromosome are in black, the Y-chromosome is vertically- 

 ruled and its mate a part of the long X-component is horizontally ruled. . 



the long X-component are in black and the Y vertically ruled 

 and its mate a part of the long X-component is horizontally 

 ruled. 



The process of division may be separated into a first and 

 second phase. 



a. The first phase. The peripheral ring of autosomes sepa- 

 rates as in a typical mitosis forming two receding parallel 



