Journal of the Washington Academy of Sciences 



THE JOURNAL OF THE WASHINGTON ACADEMY OF SCIENCES 

 is a semi-monthly publication and will be sent to subscribers on the fourth and 

 nineteenth of each month, except- during the summer, when it will appear on the 

 nineteenth only. The first volume began with the July issue and ended with 1911. 

 Volumes now will correspond to calendar years. 



Scope. — The Journal is a medium for the publication of original papers and is 

 a record of scientific work in Washington. It accepts for publication (1) brief 

 papers written or communicated by resident or non-resident members of the 

 Academy; (2) abstracts of current scientific literature published in or emanating 

 from Washington; (3) proceedings and programs of the affiliated societies; ana 

 (4) notes of events connected with the scientific life of Washington. 



Manuscripts may be sent to any member of the Board of Editors and must be 

 clearly typewritten and in suitable form for printing without essential changes. 

 The editors cannot undertake to do more than correct obvious minor errors. 

 Footnote references should be complete, including 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, altho no charge will be made for 

 printing from a suitable cut supplied with the manuscript. 



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

 unless requested. They are urged to submit their manuscript in final form and 

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



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

 receive ten copies of the number containing his contribution and as many addi- 

 tional copies as he may desire at five cents each. Reprints will be furnished at 

 cost, or approximately as follows : 



2 pp. 4 pp. 8 pp. 



25 copies .. ; ... $.55 $.60 $.65 



50 " 60 70 80 



100 " 70 80 95 



Covers: — 25 copies $.15, 50copies $:25, 100 copies $.50 



As an author may not see proof, his request for extra copies or reprints 

 should reach the editors before his paper goes to press and should preferably be 

 attached to the first page of his manuscript. 



The rate of Subscription per volume is $6.00* 



Semi-monthly numbers i 25 



Monthly numbers 50 



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

 and addressed to Alfred H. Brooks, Treasurer, Geological Survey, Washington, 

 D. C, to Williams and Wilkins Co., 2427-2429 York Road, Baltimore, Md., or to 

 the European Agents. 



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

 Mayer and Miiller, Prinz 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. 



'Volumes I and IT. however, from July 19, 1911 to December 19, 1912 will be sent for one full sub- 

 scription of $6.00. Special rates are given to members of scientific societies affiliated with the Academy. 



THE WAVERLY PRESS 

 BALTI MORE. U. S. A. 



