65 



"but on this point it is impossible for me to speak v/ith 

 certainty at present. The ni'inber of c}iro:nosoi!ies in the 

 equatorial plate is approximately 14. Tliey are small 

 roujided "bodies, rather closel^r crowded and not lyin^ in 

 exactly tl-ie saine plane (fig. 127). 



The axis of the spindle seems to hear no constant re- 

 lation to the axis of the cell. It is .Tiore usual, hovrevor, 

 to find the long axis of the spind.le coincident v/itli the 

 long axis of the mother cell. The outline of the nucleus 

 at metaphase is nearly circular, or more often, slightly 

 elongated in the direction of the axis of the spindle (fig. 

 124) . 



At anapha,se the chromosomes separate into tv/o groups, 

 probably of seven each (fig, 120), As the groups of cliro- 

 mosomes approach the poles of the spindle, the nuclear mem- 

 brane fades av/ay, and the cavity of the nucleus is oblit- 

 erated by the cytoplasm. In some cases, however, this does 

 not happen; the nuclear membrane persists throughout mito- 

 sis. During anaphase, it elongates and then pulls apart in 



the middle (fig, 129), V.Tiether this diversity in the be- 

 havior of the nuclear membrane is in any way connected 

 with certain irregularities of development to be described 

 later, is not obvious. 



