r^L 



PROBLEMS OF LAKE BIOLOGY 



Publication of the American Association 

 for the Advancement of Science 



No. 10 



Publication Committee 



R. E. COKER, Chairman 



CHANCEY JUDAY 



RAYMOND C. OSBURN 



PAUL S. WELCH 



FOREST RAY MOULTON, Editor 



Published for the American Association for the Advancement of Science by 



THE SCIENCE PRESS 

 1939 



