The Plant World 



A Monthly Magazine of General Botany 

 Established 1897 



Edited by 



Forrest Shrevb 



Published by 



The Plant World Association 



COMPOSED OF THE FOLLOWING MEMBERS: 



JoraPB Cbablbs Abthub 



Purdue Unlversltjr 

 Otis Wiluau Caldwkli. 



Unlverflty of Chicago 

 WiLUAH Austin Cannon 



Desert Laboratory 

 Gbablss Stuart Gageb 



Brooklyn Botanic Garden 

 J. Abthub Habrib 



Station for Experimental Evolution 

 BuBTON Edwabd Litinobton 



Johns Hopkins University 

 Fbancib Ebnebt Llotd 



McGUl University 

 Daniel Tbbublt MacDouoal 



CarDegle Institution of Washlnfton 



Jaubs Bebtbam Ovbbton 



University of Wlsconaln 

 GiOBOB Jaugb Pbibcb 



Stanford University 

 Chableb Louib Pollabo 



Staten Island Aasoclatlon 

 Hebbkbt Maulb Ricbabdb 



Columbia University 

 FoBBEn Shbevb 



Desert Laboratory 



yOLNBT MOROAN SpaLDINO 



Loma Linda, California 

 John Jaueb Tbornbbb 



University of Arlzon* 

 Edgab Nelson Tbanbeau 



Eastern Dllnois 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 the following rates: 



Express or postage is extra. 



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 17 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 Co., 2419-21 

 York Road, Baltimore, Md., or to The Plant World, Tucson, Arizona. 



