^^ 



A TREATISE ON THE TRANSFORMATION OF 



THE INTESTINAL FLORA 



WITH SPECIAL REFERENCE TO THE 

 IMPLANTATION OF BACILLUS ACIDOPHILUS 



BY 

 LEO F. RETTGER 



Professor of Bacteriology, Yale University 

 AND 



HARRY A. CHEPLIN 



Seessel Fellow in Bacteriology, Yale University 



YALE 



DISSERTATION. 



, JROM THE > 



r SHEFFIELD LABORATORY OF BACTERIOLOGY 

 YALE UNIVERSITY \ 



NEW HAVEN 



YALE UNIVERSITY PRESS 



LONDON • HUMPHREY MILFORD • OXFORD UNIVERSITY PRESS 



MDCCCCXXI 



