Mem. N. Y. Box. Gard. 



Vol.. IV. Pl. 5. 



".^^t."'"' -■ 





Ki-iV:: ■ 













.■.',V-;^«»j:<\.?, r>--' 





w 



1 



11 







12 







13 



m 



Pirn 



%i' 



1 5 



■% ^ 





1 6 



c S G. d^T- 



EFFECTS OF RADIUM RAYS ON NUCLEI AND MITOSIS. 



