PREFACE 



The material presented in this volume is a summary of 

 information in the process of organization for several years, 

 being maintained both in card index and tabular form. These 

 data have been consulted on numerous occasions by various 

 workers in the field of zymology. At the urgent request of 

 these workers, who have found our files and tables useful, we are 

 making this information more generally available in the present 

 form. It is our hope that this index will be of definite value 

 in the rapidly developing field of zymology. 



Ellis I. Fulmer 

 C. H. Werkman 

 Iowa State College 

 January 24, 1930 



