280 



hand frequent and conspicuous cases of amitosis were found in the 

 larger cells (Fig. 6, I — III) and less frequent, though still readily ob- 

 served cases in the smaller cells. 



H.exapoda. 

 Larvae of a flesh fly (sp. ?). The development ofi the imaginal 

 structures in the fly larva is an exceedingly rapid process. F'cm the 

 small groups of cells situated in various regions almost the whole adult 

 body is formed in the course of a few days. This rapid development 

 must of course involve very rapid nuclear multiplication. Yet in 





VI 



stages one to three days before pupation, I have been unable; to 

 discover a single mitosis. While it would be going too far to deny 

 that they occur, they are certainly exceedingly rare. Figure 7, I — VI, 



