USEFUL REFERENCES 673 



Gruenberg, Modern Science and People's Health. (Norton & Co. 



1926.) 

 Hallock and Turner, Health Heroes. Series. (Metropolitan Life Insur- 

 ance Co.) 

 Hartzog, Triumphs of Medicine. (Doubleday, Doran & Co. 1927.) 

 Harwood, New Creations in Plant Life. (The Macmillan Co.) 

 Hunter and Whitford, Readings in Science. Pp. 17-41. (The Mac- 

 millan Co. 1931.) 

 Locy, Biology and Its Makers. (Henry Holt & Co.) 

 Locy, Main Currents of Zoology. (Henry Holt & Co.) 

 Vallery-Radot, The Life of Pasteur. (Doubleday, Doran & Co. 1923.) 



