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; (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 Journal 

 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 twelfth or the twenty-eighth of the month will ordinarily 

 appear, on request from the author, in the issue of the Journal 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 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 ?opy 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 ten cents each. Reprints will be furnished at 

 the following schedule of prices: 



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

 pagination and date of issue, will be furnished jwhen ordered. 



As an author will not ordinarily see proof, his request for 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, R. L. Faris, Coast and Geodetic Survey, Wash- 

 ington, D. C. 



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



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



Missing Numbers will be replaced without cliarge, provided that claim is made 

 within thirty days after date of the following issue. 



* Volume I, however, from July 19, 191 1, to December 19, 191 1 . will be sent for $3.00 Special 

 rates are given to members of scientific societies affiliated with the Academy. 



' ESCHENBACH PRINTING COMPANY 



EASTON, PA. 



