PREFACE TO THE FIRST EDITION xi 



Tate ... Dr. Aldo Castellani ... Dr. W. J. MacNeal ... Dr. A. 

 H. Sanford ... Dr. Lendner ... Dr. Thorn ... and Dr. Waks- 

 man. ... I am indebted to my colleagues in the Department of 

 Bacteriology for many helpful suggestions, and in particular to Dr. 

 H. 0. Halvorson for his cooperation in preparing the section on 

 alcoholic fermentation. To all of these I make grateful acknowl- 

 edgment. 



Arthur T. Henrici 



The University of Minnesota 

 April 1, 1930 



