Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. LIII. No. 8. 



EFFECTS OF RADIUM ON LIVING SUBSTANCE. 



II. COMPARISON OF THE SENSITIVENESS OF DIFFERENT TIS- 

 SUES IN THE DUNG-WORM ALLOLOBOPHORA FOETIDA, 

 AND IN THE CRAYFISH CAMBARUS AFFINIS, TO THE 

 BETA RAYS OF RADIUM. 



By E. D. Congdon. 



CAMBRIDGE, MASS., U. S. A.: 



PRINTED FOR THE MUSEUM. 



February, 1912. 



