Editorial Preface 



In 1934, the Editorial Committee of the Uni- 

 versity of California approved a proposal to 

 issue a volume in honor of Professor Setchell, 

 who, in 1 93^, after forty years of active par- 

 ticipation in the life and wor\ of the Univer- 

 sity, would become seventy years of age and 

 Professor of Botany Emeritus. The editor was 

 authorized to request articles dealing with the 

 subject of the proposed boo\ from distin- 

 guished botanists in this country and abroad. 

 The magnitude of the editorial tas\ which 

 proved to be involved, together with certain 

 unforeseen circumstances causing delays, have 

 made it necessary that this anniversary volume 

 appear post festum. The editor is under great 

 obligation to the various authors for their in- 

 terest and cooperation, to Dr. Helen-Mar 

 Wheeler, and to the editorial sta§ of the Uni- 

 versity of California Press for much assistance 

 and advice. 



Since the material in this volume brings to- 

 gether authoritative statements concerning the 

 status of the various problems of geobotany, 

 its usefulness as a text for advanced students 

 and as a boo\ of reference should be consid- 

 erable. 



T. H. GOODSPEED, EDITOR. 



[VII] 



