IV] 



AND STRUCTURE OF THE CELL 



307 



5. The halves of the spht chromosomes now separate from and 

 apparently repel one another, travelUng in opposite directions 

 towards the two poles* (Fig. 92 b), for all the world as though they 

 were being pulled asunder by actual threads. 



Fig. 91 A. 



Fig. 91 B. 



central spindle 



mantle 'fibres 



split chromosome* 



Fig. 92 A. 



Fig. 92 B. 



6. Presently the spindle itself changes shape, lengthens and con- 

 tracts, and seems as it were to push the two groups of daughter- 



* Cf. K. Belar, Beitrage zur Causalanalyse der Mitose, Ztschr. f. Zellforschung, 

 X, pp. 73-124, 1929. 



