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 Spanation om 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 JourNat is issu 
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 eighth or 
the twenty-fourth of the month will ordinarily appear, on request from the author, in 
the issue of the Journau 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 
met by the author. 
Proof.—In order to facilitate prompt publication no proof will be sent to authors 
unless requested. 1t is urged that manuscript be submitted in final form; the editors 
will exercise due care in seeing that copy is followed. 
Authors’ Copies and Reprinis.—On request the author of an original article will re- 
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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.. 02.0... vc owe cae dclipobedereeane cues $6.00* 
Semi-monthly numbers... 5.c.'. cud evaw dees: cane cis tet cee tas eee .25 
Monthly numbers. i. 5020s gs os een ke Ped tons daa ens Seb aa ee wae Ue 6342. 
Remittances should be made payable to “Washington Academy of Sciences,’’ and 
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Exchanges—The Journat does not exchange 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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