96 NATIONAL TRENDS IN BIOLOGY 



cerning the organism into consideration before coming 

 to a valid conclusion, has influenced the philosophical 

 biologists profoundly. 



14. Major Walter Reed, who did exceptional work on 

 the malarial mosquito. 



15. William Richards, whose work on the revision of 

 atomic weights and in physical chemistry brought him 

 the Nobel Prize in chemistry in 1914. 



16. Edmund B. Wilson, whose profound researches on 

 the cell have given us a better understanding of that 

 biological unit than probably the work of any other single 

 individual. 



17. Robert Yerkes, whose work, together with that of 

 Mrs. Learned and Professor Kohler, on the intelligence 

 of apes has made a profound impression. 



In the field of speculative biology and biological phi- 

 losophy, one may gauge the direction of the intellectual 

 drift by the work of such men as : 



Arthur Love joy (for a list of whose books and articles 

 see Bibliography) ; 



Edmund Noble, in his Purposive Evolution (1926). 



William E. Ritter's The Unity of the Organism (2 

 vols., 1919). 



H. C. Tracy's Toward the Open (1927). 



T. H. Morgan, Critique of the Theory of Evolution 

 (1916), The Physical Basis of Heredity (1919), and The 

 Theory of the Gene (1926). 



