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 mem- 

 bers of the Academy; (2) short abstracts of certain of these articles j (3) pro- 

 ceedings and programs of meetings of the Academy and affiliated Societies; (4) 

 notes of events connected with the scientific life of Washington. The Jotjknal 

 is issued semi-monthly^ on the fourth and nineteenth of each month, except dur- 

 ing 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 second or the seventeenth of the month will ordinarily 

 appear, on request from the author, in the next issue of the Jouhnal. 



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 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. Jt is urged that manuscript be submitted in finer 

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



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

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

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

 furnished at the following schedule of prices: 



4 pp. 8 pp. IS pp. 10 pp. 



50 copies .$1.08 $1.95 $2.93 $3.80 



too copies 1.30 2.40 3.60 !.70 



Additional copi;s, per 100 45 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 

 81.00 per 100. 



As an author will not ordinarily see proof, his request •'or extra copies or re- 

 prints 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 Muller, Prinz Louis-Ferdinand Str., Berlin. 



Exchanges. — The JournaIi does not exchange with other publications. 



Missing Numbers will be replaced without charge, provided that claim is 

 made wifhin thirty 'days after date of the following issue. 



• Volume I, however, from July 19, 1911, to Docombar 19, 1911, i^ill be sent for tS.OO. Special rate* 

 ar« ipvea to njerT\W«r» of wientifio societies aiBliated with the Academy. 



THE WAVERLY PRESS 



BALTIMORE, U. S. A. 



