xii PREFACE 



diseases to which human flesh is heir. Conse- 

 quently, a knowledge of the science of microbes, or 

 bacteriology, is now incumbent on all medical men, 

 sanitary engineers, chemists, physiologists, and 

 biologists ; and even intelligent householders would 

 be all the better if they had a general knowledge of 

 the subject detailed in the following pages. 



My sincere thanks are due, and are here most 

 gratefully tendered, to Dr. E. Klein, F.RS. ; Prof. 

 P. F. Frankland, F.E.S. ; Prof. A. Gautier (of Paris) ; 

 Prof. L. Brieger (of the University of Berlin); 

 Prof. C. Tommasi-Crudeli (of the University of 

 Eome) ; Prof. I. Giglioli (of Portici, near Naples) ; 

 Dr. Eoux (of the Pasteur Institute) ; Dr. P. Miquel 

 (of Paris); Dr. T. Lauder Brunton, F.RS.; Mr. W. 

 Watson Cheyne, F.E.C.S. ; Dr. G. Sims Woodhead, 

 F.E.S.K ; Dr. C. Zeiss (of Jena) ; and Messrs. F. E. 

 Becker & Co. (of London) for valuable aid in various 

 parts of the book. 



In conclusion, it is hoped that this volume may 

 contribute something towards a proper understand- 

 ing and an intelligent appreciation of the important 

 and far-reaching subject of bacteriology. 



A. B. GEIFFITHS. 



EDGBASTON, 



January 1893. 



