Gbe TUniversftE ot Cbicago 



KCH'NDED BY JOHN D. ROCKEFELLER. 



THE BACTERIOLOGY OF WHOOPING- 

 COUGH 



A DISSERTATION 



SUBMITTED TO THE FACULTY OF THE OGDEN GRADUATE SCHOOL OF 



SCIENCE IN CANDIDACY FOR THE DEGREE OF DOCTOR 



OF PHILOSOPHY. 



(DEPARTMENT OF PATHOLOGY AND BACTERIOLOGY) 



BY 



DAVID J. DAVIS 



CHICAGO 



1906 



