26 



THE EYE IN EVOLUTION 



Fig. 11.— Jacques Loeb (1859-1924). 



JACQUES LOEB was assistant in 

 physiology at the University of 

 Wiirzburg where he was much 

 influenced by his botanical col- 

 league, Sachs ; he then went to 

 Strasbourg, and thereafter, going 

 to America, became professor of 

 physiology at the Universities of 

 Chicago and California, and 

 finally head of the Division of 

 General Physiology at the 

 Rockefeller Institute for Medical 

 Research in New York. I am 

 indebted to that institution for 

 his photograph. samuel o. 

 MAST, Professor of Zoology in 

 Johns Hopkins University, was 

 one of the band of men who have 

 made Baltimore outstanding 

 among the centres of learning in 

 the world. 



It is good to have Jaccjues 

 Loeb and Samuel Mast on the 

 same page — the two great pro- 

 tagonists of the mechanistic and 

 the vital interpretations of ani- 

 mal behaviour, both of whom 

 propagated their views with un- 

 usual vigour — the first an intel- 

 lectual descendant of Descartes, 

 the second of Leibnitz and 

 Goethe. 



Fig. 12.— Samuel O. Mast (1871-1947). 



