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 Spanatins 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 Journat for the following fourth or nineteenth, respectively. 
Manuscripis 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 
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: 
Copies 4 pp. 8 pp. 12 pp. 16 pp. Covers 
50 $ .85 $1.65 $2.55 $3.25 $2.00 
100 1.90 3.80 4.75 6.00 2.50 
150 2.25 4.30 5.25 6.50 3.00 
200 2.50 4.80 5.75 7.00 3.50 
250 3.00 5.30 6.25 7.50 4.00 
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 fof extra copies or reprints 
should invariably be attached to the first page of his manuscript. 
The rate of Subscription per volume ts..........++++ Ee tS ee $6 .00* 
Semi-monthly numbers. 5). spanwise sce ie Wh gi tet ake wise pean a ; 
Monthly numbers... <6 isi.sed atime ep dcie dete can pager a ae neg .50 
Remittances should be made payable to ‘‘Washington Academy of Sciences,’’ and 
addressed to the Treasurer, R. L. Faris, Coast and Geodetic Survey, Washington, D. C, 
European Agent: Weldon & Wesley, 28 Essex St., Strand, London. 
Exchanges—The Journat does not exchange with other publications. __ 
Missing Numbers will be replaced without charge, provided that claim is made 
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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