PREFACE 



An experience of nearly twenty years in the teaching of 

 Bacteriology has convinced the author that students of this 

 subject need a comprehensive grasp of the entire field and 

 special training in fundamental technic before specializing 

 in any particular line of work. Courses at the University 

 are arranged on this basis. One semester is devoted to 

 General Bacteriology. During the second semester the 

 student has a choice of special work in Pathogenic, Dairy, 

 Soil, Water, or Chemical Bacteriology. A second year 

 may be devoted to advanced work in any of the above 

 lines, to Immunity and Serum Therapy, or to Pathogenic 

 Protozoa. 



This text-book is intended to cover the first or introductory 

 semester's work, and requires two class-room periods per 

 week. Each student is compelled to take two laboratory 

 periods of three hours per week along with the class work. 

 The outline of the laboratory work is given at the end of 

 the text. Results attained seem to justify this plan. A 

 text-book is but one of many pedagogical mechanisms and is 

 not intended to be an encyclopedia of the subject. 



The author makes no claim to originality of content, since 

 the facts presented are well known to every bacteriologist, 

 though the method of presentation is somewhat different 

 from texts in general. During the preparation of this work 

 he has made a thorough review of the literature of Bacteri- 

 ology, covering the standard text-books as well as works of 

 reference and the leading periodicals dealing with the sub- 

 ject. Thus the latest information has been- incorporated. 



No attempt has been made to give detailed references in a 

 work of this charaicter. 



