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 scientifie 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 issued 
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 JourNnat 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. The 
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. 
Proof.—In order to facilitate prompt publication no proof will be sent to authors 
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: Authors’ Copies and Reprints.—Reprints will be furnished at the following schedule 
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are given to members of scientific societies affiliated with the Academy. 
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