Bulletin of the Museum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. LIIL No. 7. 



EFFECTS OF RADIUM ON LIVING SUBSTANCE. 



I. THE INFLUENCE OF RADL\TIONS OF RADIUM UPON THE 

 EMBRYONIC GROWTH OF THE POMACE-FLY DROSOPHILA 

 AMPELOPHILA, AND UPON THE REGENERATION OF THE 

 HYDROID TUBULARIA CROCEA. 



By E. D. Congdon, 



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



PRINTED FOR THE MUSEUM. 



February, 1912. 



