Bulletin of the Museum of Comparative Zodlogy 
AT HARVARD COLLEGE. 
Woe WEI. ! 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. Conapon. 
CAMBRIDGE, MASS., U. S. A.: 
PRINTED FOR THE MUSEUM. 
FEBRUARY, 1912, 
