Vm PKEFACE TO SIXTH EDITION 



Association of Microbiologists. The Trust Funds provided through the 

 generosity of Dr. Bergey before his death have been used in developing the 

 present edition of the Manual and future funds are to be used in the same 

 way under the management of a self-perpetuating Board of Editor-Trustees. 



We are all under obligation to those who have given so freely of their 

 time and special knowledge in preparing this edition cf the Manual. 

 Moreover the Editor-in-Chief is under special obligation to his wife, 

 Margaret Edson Breed who has carried the burden of the indexing; to Mrs. 

 Eleanore Heist Clise who has given invaluable service in bibliographical 

 research, in proof reading and other ways; and to his secretary, Miss Maude 

 Hogan, who has cared for many difficult manuscripts and a voluminous 

 technical correspondence. 



Many binomials not previously mentioned in the Manual will be found 

 in the Index of Genus and Species Names. Each new name means that 

 there is a new bibliographic reference in the text. Practically all of the 

 incomplete references of previous editions and all new references have been 

 examined in the original, something that is essential in all accurate taxo- 

 nomic work. The index of names is the most complete list that has ap- 

 peared in the literature and should always be consulted before new genus 

 or species names are proposed. 



This edition of the Manual has been more than four years in press, thanks 

 to the care that has been taken to make it complete and useful. Through- 

 out, the Editorial Board has had the cooperation and understanding help 

 of the publishers of the book who themselves have been forced to meet and 

 overcome the trying difficulties of the war years. 



The plan of the present book is such that it will be found useful both to 

 teachers and research workers. 



Robert S. Breed, Chairman 

 E. G. D. Murray 

 A. Parker Kitchens 

 Board of Editor-Trustee.?. 

 April, 1947. 



