ii4 SCIENCE REMAKING THE WORLD 



"Influenza, an Epidemiologic Study," by Warren T. Vaughan. 

 Baltimore. 1921. (Published by American Journal of Hygiene.} 



Influenza. Encyclopedia Britannica, I2th Edition, 1922, new 

 vol. 31, page 488. 



"Influenza Studies," by R. Pearl. U. S. Public Health Reports, 

 1919, vol. 34, page 1743. 



"The Epidemiology of Influenza," by W. H. Frost. U. S. Public 

 Health Reports, 1919, vol. 34, page 1823. , 



