ADVERTISEMENT 



The accompanying paper, by Dr. Guy Hinsdale, on " Atmospheric 

 Air in Relation to Tuberculosis," is one of nearly a hundred essays 

 entered in competition for a prize of $1,500 offered by the Smith- 

 sonian Institution for the best treatise " On the Relation of Atmos- 

 pheric Air to Tuberculosis," to be presented in connection with the 

 International Congress on Tuberculosis held in Washington, Sep- 

 tember 21 to October 12, 1908. The essays were submitted to a 

 Committee of Award, consisting of Dr. William H. Welch, of Johns 

 Hopkins University, Chairman ; Prof. William M. Davis, of Harvard 

 University ; Dr. George M. Sternberg, Surgeon-General, U. S. A., 

 Ret'd ; Dr. Simon Flexner, Director of Rockefeller Institute for 

 Medical Research, New York ; Dr. Hermann M. Biggs, of New 

 York, General Medical Officer, Department of Health, New York 

 City; Dr. George Dock, Medical Department, Washington Univer- 

 sity, St. Louis; and Dr. John S. Fulton, of Baltimore, Secretary 

 General of the Congress on Tuberculosis. Upon the recommenda- 

 tion of the committee, the prize was divided equally between Dr. 

 Guy Hinsdale, of Hot Springs, Virginia, and Dr. S. Adolphus Knopf, 

 of New York City. 



At the request of the Institution, Dr. Hinsdale has revised his 

 essay so as to indicate some of the advances made in the study 

 of the subject during the past five years. 



Charles D. Walcott, 

 Secretarv of the Smithsonian Institution. 



Washington, December, 1913. 



