AMERICAN 
JOURNAL OF BOTANY 
Devoted to All Branches of Botanical Science 
Established 1914 
EDITED BY A COMMITTEE OF THE 
BOTANICAL SOCIETY OF AMERICA 
EDITORIAL committee 
C. E. Allf.n, Editor-in-Chief, 
University of Wisconsin 
William Croker, ' L. R. Jones, 
University of Chicago University of Wisconsin 
C. Stuart Gager, Business Manager Orland E, White, 
Brooklyn Botanic Garden Brooklyn Botanic Garden 
R.A.Harper, Jacob R. Schramm/ 
Columbia University Cornell University 
C. L. Shear, Bureau of Plant Industry 
(Representing American Phytopathological Society) 
The Journar is published monthly, except during August and September. 
Subscription price, $6.00 a year. Single copies 75 cents. Back numbers, 75 cent's 
each; $6.00 a volume^ postage extra. Postage will be charged to all foreign coun^ 
tries, except ' Mexico, Cuba, Porto Rico, Panama Canal Zone, Republic , of 
Panama, Hawaii, Philippine Islands, Guam, Samoan Islands, and Shanghai. 
Postage to Canada, 20 cents a volume on annual subscriptions; to all other coun- 
tries in the Postal Union, 40 cents a volume on annual Subscriptions. 
The pages of the Journal are open to members of the Botanical Society of 
America, or to candidates approved for membership. 
Manuscript offered for publication should be typewritten, and should in all 
cases be submitted to the Editor-in-Chief. 
Papers are limited, to 2G pages in length,' exclusive of plates, except that ad- 
ditional pages may be, ar'ranged for at cost rate to authors (approximately' $3.00 a 
page). 
, Proofs should be corrected immediately on receipt, and returned to American 
Journal of Botany, Brooklyn Botanic Garden, Brooklyn, N. Y. 
■ Illustrations, other than zinc etchings, and tabular matter should, in general, 
be restricted to approximately ten percent of the number of pages of text. 
Authors may be charged at cost rates for illustrations and tabular matter in 
excess of that amount (approximately $6.40 a page for tabular matter ; J5 cents 
per square inch for half-tones). 
Separates should be ordered wben proof is returned. Ffty copies without 
cover will be supplied free; cover and additional copies at cost. 
Remittances should be made payable to American Journal of Botany. Ten 
cents must be added to all checks not dirawn on New York City banks. 
Claims for missing numbers should be made within 30 days if oUowing their 
date of mailing: The publishers vv^ill supply missing numbers free only when 
they have been lost in the mails. 
Correspondencie concerning editorial matters should be addressed to Prof. C, 
E. Alleri, University of Wisconsin, Madison, Wisconsin. 
Business' corres|iondenCe. including notice of change of address, and directions 
concerning reprints, should be addressed to American Jourrial of Botany, Brook- 
lyn Botanic Garden, Brooklyn, N. Y'., or 41 North Queen Street, Lancaster, Pa. 
