LIGHT AND THE BEHAVIOR 

 OF ORGANISMS 



BY 



S. O. MAST, Ph.D. 



ASSOCIATE PROFESSOR OF BIOLOGY, GOUCHER COLLEGE, 

 JOHNSTON RESEARCH SCHOLAR, JOHNS 

 HOPKINS UNIVERSITY (1907-1908) 



FIRST EDITION 



FIRST THOUSAND 



NEW YORK 

 JOHN WILEY & SONS 



London : CHAPMAN & HALL, Limited 



1911 



