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PREFACE. 



FEELING the need of a Compendium on the subject of 

 this work, it has been our aim to produce a concise treatise 

 upon the Practical Bacteriology of to-day, chiefly for the 

 medical student, which he may use in his laboratory. 



It is the result of experience gained in the Laboratory 

 of the Hygienical Institute, Berlin, under the guidance of 

 Koch and Frankel ; and of information gathered from the 

 original works of other German, as well as of French, 

 bacteriologists. 



Theory and obsolete methods have been slightly touched 

 upon. The scope of the work, and want of space, forbade 

 adequate consideration of them. The exact measurements 

 of bacteria have not been given. The same bacterium 

 varies often much in size, owing to differences in the media, 

 staining, etc. 



We have received special help from the following books, 

 which we recommend to students for further reference : 



MAC: TraitS pratique de Bacteriologie. 

 FRANKEL: Grundriss der Bakterienkunde. 

 EISENBERG: Bakteriologische Diagnostik. 

 CROOKSCHANK, E. M.: Manual of Bacteriology. 

 GUNTHER: Einflihriug in das Studium der Bacteriologie, etc. 

 WOODHEAD AND HARE : Pathological Mycology. 

 SALMONSEN: Bacteriological Technique (English translation). 



M. V. BALL. 



BUFFALO, N. Y., October 1, 1891. 

 62 Delaware Avenue. 



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