PLATE 5 



EFFECTS OF RADIUM RAYS ON NUCLEI AND NUCLEAR DIVISION IN 



ALLIUM CEPA 



PAGE. 



Figs. i-io. Amoeboid shapes assumed by nuclei when exposed to 



radium rays .......... 232 



9-12. Stages in the division of nucleoli ..... 232 



13. Tendency to the formation of a double spindle . . . 233 



14-18. Abnormal mitoses. ....... 232 



