vi PREFACE TO THE SECOND EDITION 



understand and more intelligently discuss the many problems of the 

 morphology of bacteria. He also maintained that an elementary 

 knowledge of mycology, including a vocabulary, should be a special 

 requisite for writers on variation and so-called life cycles in bac- 

 teria. He frequently predicted that, if and when sexuality in bac- 

 teria was demonstrated and proved, the persons responsible would 

 be individuals wdth some knowledge of modern mycology. We, 

 therefore, have not cut the discussions of life cycles in Chapter I and 

 "sexuality" of yeasts in a later chapter. Rather we have, as 

 Henrici explicitly intended, expanded them considerably. The in- 

 creased knowledge in recent years in the very things of greatest 

 importance to the bacteriologist, namely, "sexuality" in fungi and 

 medical and industrial applications of mycology, has necessitated a 

 larger book. This was foreseen by Henrici who at one time con- 

 sidered the advisability of two separate volumes. 



Unfortunately, information on certain subjects was unavailable 

 to us because of its restricted or confidential nature or because cer- 

 tain published materials were not available in the United States 

 during the war period in which the manuscript was prepared. We 

 should like to ask the indulgence of our readers on such matters and 

 we hope that it will be possible to rectify these omissions later. 



Although separated by half a continent, we have kept in touch 

 with one another by correspondence and most parts of the text have 

 been read and approved by the other two authors. Troublesome 

 points in nomenclature and other slight differences of opinion were 

 resolved by copious use of the mails. Although many suggestions 

 from the other two authors were incorporated, in general Chapter I 

 was prepared by Skinner from Henrici 's notes; Chapter II is Hen- 

 rici's own; Chapter III was prepared by Skinner from Henrici's 

 notes, and many additions, deletions, and rearrangements were made 

 by Emmons; Chapters IV, V, IX, and XII were prepared by Skinner; 

 Chapters VI, VII, X, and XIII by Emmons; and Chapters VIII, XI, 

 and XIV by Tsuchiya. We hope that those who use the book will 

 make comments and criticisms and write their suggestions for im- 

 provement. 



We wish to express thanks to various individuals who have assisted 

 us: to Dr. Louise Dosdall who read the rough draft of Chapter I 

 and made many suggestions for materials to be included; to Dr- 

 B. O. Dodge who read the same chapter in its nearly final form; to 

 Dr. J. J. Christensen who went over the discussion on the Basidio- 

 mycetes; to Dr. Charles Thom who made many suggestions for the 

 revision of Dr. Henrici's chapter on Fungi Imperfecti, and to Dr. 



