PREFACE 



The rapid growth of the science of Bacteriology has led to the development of 

 numerous combinations of materials for the propogation of microorganisms. 

 It was felt that the collection and orderly arrangement of such culture media 

 would be of assistance in the future development of the science of Bacteriology, 

 and the authors were gratified with the opportunity to perform this service. 



In spite of the efforts to thoroughly cover the literature, this compilation is 

 probably incomplete, particularly with respect to formulae published in bulletins 

 and monographs which were not available or consulted. It is hoped that this 

 compilation will help acquaint the bacteriologists with the numerous types and 

 combinations of materials which have been employed for cultivating micro- 

 organisms, and if it serves to check the needless publication of new formulae, 

 which are really old, the authors will feel well repaid for their time and efforts. 



To Mr. H. G. Dunham, of the Digestive Ferments Company, we are greatly 

 indebted for helpful criticisms, and suggestions. 



To Mrs. C. H. Werkman, Miss Ruth Confare and Miss Lois Kratoska, the 

 authors extend cordial thanks for assistance in typewriting and correcting the 

 manuscript. 



To Dr. R. E. Buchanan the authors wish to particularly express their indebt- 

 edness and gratitude for the fatherly advice, encouragement, and assistance, so 

 graciously rendered at all times. 



Max Levine, 



h. w. schoenlein. 



Iowa State College, 



Ames, Iowa, 



July 1, 1929 



