PLATE 6 



EFFECTS OF RADIUM RAYS ON MITOSES 



PAGE. 



Fig. I. Occurrence of two independent mitoses in the division of one 



nucleus ........... 233 



2, 4, 7, 8, 9, 10. Irregularities in mitoses .... 232 



3, 5, 7. Failure of some of the chromosomes, or portions of 

 chromosomes, to take part in the organization of the daughter 

 nuclei ........... 232 



6. Secondary nuclei, doubtless organized by chromosome-frag- 

 ments that failed to take part in the organization of the main 

 (daughter) nucleus when the cell containing them was formed . 233 



