THE STRUCTURE OF CELLS 



35 



nature, as well as the meaning of the events which are thus bound 

 up with the two divisions under consideration. The indications 



FIG. 17. 



Diagrams of Heterotype and Homotype mitoses to illustrate the various possible ways of 

 interpreting the chromosome distribution. 



afforded by the constancy in number of the chromosomes through 

 the cell-generations of an organism point to a morphological per- 

 manence, and it has been argued that the same chromosomes re- 

 peatedly are re-formed at each mitosis. 



