PREFACE 



Agricultural and Industrial Bacteriology is based on 

 practical experience as a teacher and lecturer during the 

 last sixteen years, and has been written to supply a need 

 constantly felt during these years of practical work with 

 students of agriculture — the need for a book to include 

 those bacteriological topics fundamental in everyday life 

 on the farm and in the industries. The volume has also 

 been written for textbook use and to serve as a reference 

 work for students and the many men and women interested 

 in agricultural and industrial problems. 



Written along such lines, and for such a public. Agricul- 

 tural AND Industrial Bacteriology contains no detailed 

 discussion of methods and technique, since it is not intended 

 to serve as a manual of laboratory practice. This volume 

 has been written to lay a satisfactory and practical founda- 

 tion on which may be based more advanced work in the 

 specialized applications of bacteriology in dairying, soil tech- 

 nology, forestry, plant pathology, and various industries 

 such as bottling, baking and canning. 



In certain parts of the book it is assumed that the reader 

 possesses some knowledge of chemistry and biology; but the 

 major portion of the volume requires no such background 

 of previous work and preparation. 



R. E. Buchanan. 



Iowa State College. 



