Journal of the Washington Academy of Sciences 



Thii 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) 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 scientific 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 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 ths 

 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 mote 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. It is urged that manuscript be 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 gratis ten copies of the number containing his contribution and as 

 many additional copies as he may desire at five cents each. Reprints will be 

 furnished at the following schedule of prices: 



4 pp. 8 pp. 13 pp. 16 pp. 



50 copies $1.08 81.95 12.93 $3.80 



lOOcopiee 1.30 2.40 3.60 4.70 



Additional copies, 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 

 §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. 



Ths 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 Qreenmount 

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



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

 Mayer and Muller, Prina 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. 



• Volurat I. however, from July 10, 1911 to December 19. 1911, will bt Mnt for $5.00. 8peda! r»t*» 

 am itir*n to member* of eciantifio aometies affiliated with the Academy. 



THE WAVERLY PRESS 



BALTIMORE. U. S. A. 



