The Plant World 



A Monthly Magazine of General Botany- 

 Established 1897 



Edited by 



Forrest Shrevb 



Published by 



The Plant World Association 



COMPOSED OP THE FOLLOWING MEMBERS: 



JOBBPB ChABLBS AbtHUB 



Purdue Unlverelty 

 Otis William Caldwbll 



University of Chlcaco 

 William Austin Cannon 



Desert Laboratory 

 Chables Stuabt Gageb 



Brooklyn Botanic Garden 

 J. Abthub Habbib 



Station for Experimental Evolution 

 BuBTON Edwabd Livingston 



Johns Hopkins University 

 Fbancib Ebnbst Llotd 



McGUl University 

 Danibl Tbbmblt MacDoxtoal 



Carnegie Institution of Washington 



James Bbbtbau Ovebtor 



University of Wisconsin 

 QEOBas Jambs Pbibob 



Stanford University 

 Chableb Louis Pollabo 



Staten Island Assoclatloa 

 Hbbbebt Maulb Richabdb 



Columbia University 

 FoBBEBT Shrevb 



Desert Laboratory 



VOLNET MOBGAN SpALDINQ 



Loma Linda, California 

 John Jambs Thobnbbb 



University of Arlsona 

 Edgab Nbi£on Tbansdau 



Eastern Dlinois 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 aa 

 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., 2419-2! 

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



