Journal of the jJVashington Academy of Sciences 



This JoxTRNAL, the ofiBcial organ of the Washington Academy of Sdenoec, 

 aimi 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 cturent scientific literature published 

 in or emanating from Washington; (3) proceedings and programs of meetings of 

 the Academy and affiUated Societies; (4) notes of erents connected with the 

 scientific life of Washington. The Jourkal 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 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 copy is followed. 



Authors' Copies and Reprints.— Oa 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: 



Copiea 4 pp. 8 pp. 12 pp. 16 pp. C»veri 



60 $1.40 $2.80 $4.20 $5.60 $1.15 



100 1.60 3.20 4.80 6.40 1.40 



160 1.80 3.60 5.40 7.20 1.65 



200 2.00 4.00 6.00 8.00 1.00 



260 2.20 4.40 6.60 8.80 2.16 



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

 pagination and date of issue, will be furnished when 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 26 



Monthly numbers 60 



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

 and addressed to the Treasurer, R. L. Paris, Coas£ and Geodetic Survey, Wash- 

 ington, D. C. 



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



Exchanges. — ^The Joxjrnal 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. 



* Valume I, howeyer, from July 19. 1911, to December 19, 1911, will lie tent for $i 00 Specail 

 rates arc given to member* of scientific locietiea affiliated with the Academy. 



