AMERICAN 
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JOURNAL OF BOTANY 
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Devoted to All Branches of 
BOTANICAL SCIENCE 
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•sS 
ESTABLISHED 1914 
EDITED BY A COMMITTEE OF THE 
BOTANICAL SOCIETY OF AMERICA 
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EDITORIAL COMMITTEE 
William Crocker, 
The Thompson Institute 
For Plant Research, Inc. 
C. Stuart Gager, Business Manager 
Brooklyn Botanic Garden 
R. A. Harper, 
Columbia University 
C. E. Allen, Editor-in-Chief, 
University of Wisconsin 
H. H. Bartlett, 
University of Michigan 
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Arthur H. Graves, 
Brooklyn Botanic Garden 
I. F. Lewis, 
University of Virginia 
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Donald Reddick, Cornell University 
(Representing American Phytopathological Society) 
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The Journal is published monthly, except during August and September. Subscription 
price, $6.oo a year. Postage to Canada, 20 cents; to other foreign countries (except Mexico and 
Cuba) 40 cents a volume on annual subscriptions. Single copies 75 cents. Back numbers, 75 cents 
each; $7.00 a volume, post free. 
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 20 pages in length, including plates, except that additional pages may 
be arranged for at cost rate to authors (approximately $4.60 per page). 
Illustrations and tabular matter together should, in general, be limited to approximately 
ten percent of the total number of pages. Authors may be charged at cost rates for illustrations , 
and tabular matter in excess of that amount (approximately $6.40 per page for tabular matter; 
halftones $8.30 per page, $5.80 per half page; zinc etchings $5.50 per page, $3.90 per half page) 
For smaller figures the minimum charge is $3.75 each for half-tones, and $2.50 each for zinc etchings. 
Proofs should be corrected immediately on receipt, and returned to American Journal of 
Botany, Brooklyn Botanic Garden, Brooklyn, New York. 
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Separates should be ordered when proof is returned. Fifty copies without cover will be 
supplied free; cover and additional copies at cost. 
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Remittances should be made payable to American Journal of Botany. 
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, 
, jpoi 
University of Wisconsin, Madison, Wisconsin. 
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Business correspondence, including notice of change of address, and, directions concerning 
reprints, should be addressed to Americaii Journal of Botany, Brooklyn Botanic Garden, Brooklyn, 
N. Y., or The New Era Printing Co., Inc., Lancaster, Pa. ^ 
