3 



\n^ 



Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. LIII. Nos. 7-8. 



EFFECTS OF RADroM ON LIVING SUBSTANCE. 



I. THE INFLUENCE OF RADIATIONS OF RADIUM UPON THE 



EMBRYONIC GROWTH OF THE POMACE-FLY DROSOPHILA 

 AMPELOPHILA, AND UPON THE REGENERATION OF THE 

 HYDROID TUBULARIA CROCEA. 



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. 



