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. Allen, Editor-in-Chief, 
University of Wisconsin 
C. Stuart Gager, Business Manager L. R. Jones, 
Brooklyn Botanic Garden University of Wisconsin 
R. A. Harper, Edgar W. Olive, 
Columbia University Brooklyn Botanic Garden 
A. S. Hitchcock, Jacob R. Schramm, 
Bureau of Plant Industry Cornell University 
F. D. Kern, State College of Pennsylvania 
(Representing American Phytopathological Society) 
The Journal is published monthly, except during August and September. 
Subscription price, l5.ooajear. Single copies 60 cents, plus postage. Postage will 
be charged to all foreign countries, 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 subscrip- 
tions ; to all other countries in the Postal Union, 40 cents a volume on annual sub- 
scriptions. 
The pages of the Journal are open to members of the Botanical Society of 
America, or candidates approved for membership. 
Manuscript offered for publication should be typewritten, and should in all 
cases be submitted to the Editor-in-Ch|ef . 
Papers are limited to 20 pages in length, exclusive of plates, except that ad- 
ditional pages maybe arranged 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. Author 
may be charged at cost rates for illustrations and tabular matter in excess of that 
amount (approximately $5.60 a page for tabular matter ; 15 cents per square inch 
for half-tones). 
Separates should be ordered when proof is returned. Fifty 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 drawn on New York City banks. 
Claims for missing numbers should be made within 30 days following their 
date of mailing. The publishers will supply missing numbers free only when they 
have been lost in the mails. 
Correspondence concerning editorial matters should be addressed to Prof. C. E. 
Allen, University of Wisconsin, Madison, Wisconsin. 
Business correspondence, including notice of change of address^ and directions 
concerning reprints, should be addressed to American Journal of Botany, Brook- 
lyn Botanic Garden, Brooklyn, N. Y., or 41 North Queen Street, Lancaster, Pa. 
