Journal of the Washington Academy of Sciences 



This Journal, the oflScial organ of the Washington Academy of Sciences, 

 aima to present a brief record of current scientific work in Washington. To this 

 •nd it publishes: (I) short original papers, written or communicated by mem- 

 bers of the Academy; (2) a complete list of references to current scientific articles 

 published in or emanating from Washington; (3) short abstracts of certain of 

 these articles; (4) proceedings and programs of meetings of the Academy and 

 affiliated Societies; (6) notes of events connected with the scTentific life of Wash- 

 ington. 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 esscntiftl 

 feature; a manuscript reaching the editors on the second or the eevenf eenth of the 

 month will ordinarily appear, on request from the author, in the next issue of the 

 Journal. 



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 tc text 

 figures or diagrams of simple character. The editors, at their discretion, may 

 call upon an author to defray the cost of his illustrations, although no charge 

 will be made for printing from a suitable cut supplied with the manuscript. 



Proof. — In order to facilitate prompt publication no proof will be sent to 

 authors unless requested. It is urged that manuscript oe submitted in final 

 form ; the editors will exercise due care in seeing that copy is followed. 



Authors' Copies and Reprints. — On request the author of an original article 

 will receive giatis ten copies of the number containing his contribution and as 

 many additional copies as he may deuire at ten cents each. Reprints will be 

 furnished at the following schedule of prices: 



4 pp. 8 pp. 12 pp. 16 pp. 



50 copies $1.08 $1.95 $2.93 $3.80 



100 copies 1.30 2.40. 3.60 4.70 



Additional copies, per 100 46 90 1.35 1.70 



Covers bearing the name of the author and title of the article, with inclusive 

 pagination and date of issue, will be $2.00 for the first 100. Additional covers 

 $1.00 per 100. 



As an author may not 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 is $6.00* 



Semi-monthly numbers .25 



Monthly numbers 50 



Remittances should be made payable to "Washington Academy of Sciences," 

 and addressed to the Treasurer, William Bowie, Coast and Geodetic Survey, 

 Washington, D. C, to Williams & Wilkins Company, 2419-2421 Greenmount 

 Ave., Baltimore, Md., or to the European Agents. 



European Agents: William Wesley & Son, 28 Essex St., Strand, London, and 

 Mayer and MQller, Prim Louis-Ferdinand Str., Berlin. 



Exchanges. — ^The Journal 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. 



' Vohime I, however, from July 10, 1911, to December 19, 1011, will be eent (or 13.00. Special rataa 

 are given to members o( loientifle soeieties afiSliated with the Aoademjr. 



THE WAVERLY PRK88 

 BALTIMORE. U. B. A. 



