Bulletin of the Museum of Comparative Zodlogy 
AT HARVARD COLLEGE. 
Won LIT.) No. 7. 
EFFECTS OF RADIUM 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. 
By E. D. Conepon. 
CAMBRIDGE, MASS., U.S. A.: 
PRINTED FOR THE MUSEUM. 
FEBRUARY, 1912. 
