Journal of the Washington Academy of Sciences 
This JourNAL, the official organ of the Washington Academy of Sciences, aims to 
present a brief record of current scientific work in Washington. To this end it publishes: 
(1) short original papers, written or communicated by members of the Academy; (2) 
short notes of current scientific literature published in or emanating from Washington; 
(3) proceedings and programs of meetings of the Academy and affiliated Societies; (4 
notes of events connected with the scientific life of Washington. The JouRNAL is issue 
semi-monthly, on the fourth and nineteenth of each month, except during the summer 
when it appears on the nineteenth only. Volumes correspond to calendar years. Prompt 
publication is an essential feature; a manuscript reaching the editors on the fifth or 
the twentieth of the month will ordinarily appear, on request from the author, in the 
issue of the Journat for the following fourth or nineteenth, respectively. 
Manuscripts may be sent to any member of the Board of Editors; they should be 
clearly typewritten and in suitable form for printing without essential changes. 
editors cannot undertake to do more than correct obvious minor errors. References 
should appear only as footnotes and should include year of publication. 
Illustrations will be used only when necessary and will be confined to text figures 
or diagrams of simple character. The cost of producing cuts for illustrations must be 
partly met by the author. te 
Proof.—In order to facilitate prompt publication no proof will be sent to authors 
unless requested. It is urged that manuscript be submitted in final form; the editors 
will exercise due care in seeing that copy is followed. 
Authors’ Reprints.—Reprints will be furnished at the following schedule of prices: 
Covers bearing the name of the author and title of the article, with inclusive pagi- 
nation and date of issue, will be furnished when ordered. 
As an author will not ordinarily see proof, his request for extra copies or reprints 
should invariably be attached to the first page of his manuscript. 
The rate of Subscription per volume 48... .. ss veasnsss cubs trcces sh paeebasite $6 .00* 
Semi-monthly numiberss...\.: 7... sees sastecie a wtp efeak Gets allele an tie aan .25 
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Exchanges—The Journat does not exchange with other publications. | 
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* Volume I, however, from June 19, 1911, to: December 19, 1911, will be sent for $3.00. Special rates 
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