8 THE STUDY OF PLANT COMMUNITIES 



versity of Nevada, Dr. M. F. Buell at Rutgers University, Dr. R. B. 

 Livingston at the University of Missouri, and by Dr. J. F. Reed at 

 the University of Wyoming, as well as at Duke University. The 

 comments and suggestions derived from both students and instruc- 

 tors led to revisions and additions which are invaluable, particular- 

 ly in their contribution to wider utility. It is truly with deep 

 appreciation that the cooperation and assistance from all these 

 sources is acknowledged. 



Finally, although credit lines indicate the sources of illustrations, 

 it is a real pleasure to acknowledge the courtesies and helpfulness 

 of the numerous individuals and organizations involved. The ex- 

 cellent material they made available, sometimes with considerable 

 trouble to themselves, often made it necessary to choose from sev- 

 eral possibilities for a single illustration. It is regretted that not all 

 the pictures could be used. The line-drawings were done by 

 George A. Thompson and Robert Zahner whose assistance is 

 gratefully acknowledged. 



HENRY J. OOSTING 



Durham, North Carolina 

 February, 1948. 



