STUDY OF CELL MECHANICS 



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position of the spindle in the egg. Judging from the large num- 

 ber of cases observed similar to these figures, the usual behavior 

 of spiral aster eggs is that shown. Here and there, however, 

 eggs, which have apparently arisen from those in which the rays 

 were bent, are found which have a different history. Typical 



cases are shown in figures C, D, and E. The eggs shown in fig- 

 ures C and D, may be derived, perhaps, from eggs similar to the 

 one shown in figure 5, in which the chromosomes are prepon- 

 derantly on one side. In this event, a true spindle is not formed, 

 but the one center goes apart from the other dragging with it a 

 few chromosomes, as shown in figure C, and an abortive attempt 

 at division is made. Figure D shows a stage of this. Figure E 



