﻿SMITHSONIAN MISCELLANEOUS COLLECTIONS 



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AN INVESTIGATION ON THE INFLUENCE UPON THE 

 VITAL RESISTANCE OF ANIMALS TO THE MICRO- 

 ORGANISMS OF DISEASE BROUGHT ABOUT BY 

 PROLONGED SOJOURN IN AN IMPURE 

 ATMOSPHERE 



BY 



D. H. BERGEY, M. D. 



First Assistant, the Laboratory of Hygiene, University of Pennsylvania, 

 Philadelphia, Pa. 



CITY OF WASHINGTON 

 PUBLISHED BY THE SMITHSONIAN INSTITUTION 



1898 



