TRANSLATOR'S NOTE. 



WORKS on bacteriology, on pathology, and on clinical 

 diagnosis are not wanting in any language, but we know 

 of only one on clinical bacteriology, and as a consideration 

 of the subject from this aspect must appeal to a large body 

 of the profession, it was thought a service might be ren- 

 dered by a translation of this admirable publication, whose 

 authors are well and favorably known for their original 

 work in both clinical medicine and bacteriology. The 

 general practitioner can scarcely be expected to be a 

 trained and practised bacteriologist, but he must have a 

 working familiarity with the subject of bacteriology in order 

 that he may possess clear conceptions as to the etiology of 

 disease and the nature of the resultant morbid processes, 

 leading to a rational application of measures and methods 

 of prophylaxis and treatment. To these ends it is hoped 

 the present publication will contribute. The work of 

 translation is coupled with especial and personal pleasure 

 from the fact that both junior author and translator 

 participated simultaneously in the work in bacteriology 

 in the Hygienic Institute at Berlin in the spring of 1890. 



It has been thought advantageous to add illustrations to 

 the English version. A. A. E. 



PHILADELPHIA, February, 1900. 



