PREFACE xi 



the author, has been carefully noted. The author wishes to express 

 his thanks to Professor Oakes Ames, his former teacher and Head 

 of the Department of Economic Botany of Harvard University, for 

 the patience with which he has directed, counseled, and aided him, 

 and made possible the completion of this work. The author alone, 

 however, is responsible for any errors which may be embodied in the 

 subject-matter. The author sincerely appreciates the constructive 

 counsel of Mr. F. Tracy Hubbard in respect to bibliographical and 

 systematic work; and of Dr. James Plummer Poole of Dartmouth 

 College. The author is also indebted to Mr. Lally and to Mr. 

 Butler of the wholesale coffee-house of Messrs. Chase & Sanborn 

 of Boston, Massachusetts, for the photograph of a Brazilian Coffee 

 Plantation and for numerous samples of the commercial coffees of 

 the world ; to the U. S. National Herbarium, Washington, D. C. ; 

 and to the Gray Herbarium of Harvard University, institutions 

 which very kindly placed at his disposal their entire collection of the 

 species of Cojfea L. 



The author recognizes with appreciation the care exercised by 

 Professor Arthur H. Nason, Ph.D., Director of the New York 

 University Press, and by Miss Hannah E. Steen, Secretary to the 

 Director, in the details of editing and proof-reading. It is with 

 pleasure that the author expresses his gratitude to his colleagues, 

 Professor L. Alfred Mannhardt, of the department of biology in the 

 Washington Square College of New York University, and to Pro- 

 fessor James Buell Munn, Ph.D., acting dean, for the assistance and 

 courtesies which have encouraged the publication of this work. 



R. H. C. 



Department of Biology 

 Washington Square College 

 New York University 

 1924. 



