Journal of the Washington Academy of Sciences 
This JourNAt, 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 issu 
semi-monthly, on the fourth and nineteenth of each mont \ except during the summer ny 
when it appears on the nineteenthonly. Volumes correspond to calendar years. Prompt 
publication is an essential feature; a manuscript reaching the editors on the eighth or 
the twenty-fourth of the month will ordinarily BpHOnts 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 prinhaa nee 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. 
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Proof.—In order to facilitate prompt publication no proof will be sent to authors 
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Exchanges—The Journat does not exehange with other publications. —_ 
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within thirty days after date of the following issue. 
*Volume I, however, from June 19, 1911, to December 19, 1911, will be sent for $3.00. Special rates 
are given to members of scientific societies affiliated with the Academy 
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