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: 

 Chablbs Loc9 Pollabo, Founder 



JOIBPB ChABLBS ABTHT7B 



Purdue Univeraity 

 Ora William Caldwell 



Teacher's College, Columbia University 

 WiLLiAU AuBTm Cannon 



Desert Laboratory 

 J. Abthub Habbib 



Station for Experimental Evolution 

 BnBTOR Edwabd Livinqston 



Johns Hopkins University 

 Vbakoib Ebne»t Llotd 



McGill University 

 Edwih Bkmnbtt McCallum 



Continental Rubber Company 



Daniel Tbbmblt MacDouqal 



Carnegie Institution of Washingtoa 

 James Bebtbam Ovebton 



University of Wist-onstn 

 Gbobqe Jamba Pbircb 



Stanford University 

 Hebbbbt Maulb Ricbabds 



Columbia University 



FOBBB'T ShBBVB 



Desert Laboratory 

 John James Thornbeb 



University of ArtzonB 

 Edgab Nelson Tbansbai; 



Ohio State University 



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 contributious 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 copias 

 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 ar« 

 $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. 



Mttke 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. 



