The Plant World 



ESTABLISHED 1897 



An illustrated monthly journal devoted to all departments of botany 



and its allied and applied branches. 



Edited by Forrest Shreve, Tucson, Arizona 

 Published by 



THE PLANT WORLD ASSOCIATION 

 composed of the following members 



Charles Louis Pollard, Founder 



Joseph Charles Arthur 



Purdue University 

 Otis William Caldwell 



University of Chicago 



William Austin Cannon 

 Desert Laboratory 



J. Arthur Harris 



Station for Experimental Evolution 



Burton Edward Livingston 



Johns Hopkins University 



Francis Ernest Lloyd 

 McGill University 



Edwin Bennett McCallum 



Continental Rubber Company 



Daniel Trembly MacDougal 



Carnegie Institution of Washington 



James Bertram Overton 



University of Wisconsin 



George James Peirce 



Stanford University 

 Herbert Maule Richards 



Columbia University 

 Forrest Shreve 



Desert Laboratory 

 John James Thornber 



University of Arizona 



Edgar Nelson Transeau 



Ohio State University 



Have You Seen a Recent Number of the Plant World? 



Even if you have let us send you another, together with the table of 

 contents of the last volume. Send us a card with your address today. 



Our articles cover every phase of current activity in botany, and the 

 application of scientific principles to agriculture, horticulture, forestry, 

 soil physics and all lines of plant production or plant utilization. Our 

 pages record the advances of work in the laboratories and in the field, 

 and the observations of botanical travelers and explorers. Our reviews 

 afford a means of keeping in touch with the most important books and 

 journal articles. 



The Plant World is the most readable journal in which the progress 

 of scientific botany may be followed. It is not only necessary to those 

 who are actively interested in botany, but it is indispensable to the teacher 

 and student and to every person who grows or uses plants, or wishes to 

 follow the rapid development of present-day science. 



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THE PLANT WORLD 



TUCSON, ARIZONA 



