The Plant World 



A Monthly Journal of General Botany 



Established 1897 



Edited by 



Forrest Shreve 



Published by 



The Plant World Association 



COMPOSED OF THE FOLLOWING MEMBERS: 

 Chables Loub Pollabd, Founder 



JoBBPH Charles Arthur 



Purdue University 

 Otm William Caldwell 



Univerrity of Chicago 

 William Austin Cannon 



Desert Laboratory 

 J. Arthur Habrib 



Station for Experimental Evolution 

 Burton Edward LrviNasTON 



Johns Hopkins University 

 FsANcm Ebnest Llotd 



McGill University 

 Edwin Bennett McCallum 



Continental Rubber Company 



Daniel Tbeublt MacDougal 



Carnegie Institution of Washington 

 James Bertram Ovebton 



University of Wisconsin 

 Geobge Jambs Pbibcb 



Stanford University 

 Hbbbbbt Maulb Richabds 



Columbia University 

 Fobbest Shbgvb 



Desert Laboratory 

 Jo£[N James Thornbbr 



University of Arizona 

 Edqar Nelson Transeau 



Eastern Illinois Normal School 



All manuscripts submitted for publication should be type-written and in good 

 order. Galley proof is submitted to the author who should return it as early as 

 possible to the Editor. Reprints should be ordered on a blank for that purpose 

 which accompanies the galley proofs. 



Reprints will be supplied at cost, at approximately the following rates: 



Advertising rates will be furnished on application. 



Address all correspondence regarding contributions and reprints, and all 

 books for review to The Editor, The Plant World, Tucson, Arizona. 



The subscription price is $2.50 per annum in the United States, its overseas 

 dependencies, and Canada and Mexico; $3.00 to other countries. Single copies 

 are 30 cents each. Volumes 1 to 7 inclusive can not be supplied; Volumes 10 

 and 11 can be supplied incomplete; Volumes 8 and 9, and Volumes 12 to 20 are 

 $2.50 each. 



Missing numbers lost in the mails will be replaced gratis only when notice 

 is received within one month of date of issue. 



Make all remittances payable to The Plant World. Address all correspond- 

 ence regarding subscriptions, discontinuances, changes of address, back num- 

 bers and early volumes to: The Waverly Press, Williams & Wilkins Company, 

 2419-21 Greenmount Avenue, Baltimore, Md., or to The Plant World, Tucson, 

 Arizona. 



