Journal of the Washington Academy of Sciences 



THE JOUENAL OF THE WASHINGTON ACADEMY OF SCIENCES is a 

 Bemi-monthly publication and will be sent to subscribers on the fourth and nine- 

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

 teenth 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, although no charge will he made 

 for printing from a suitable cut supplied with the manuscript. 



Proof. — In order to secure prompt publication no proof will be stent 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 reguest 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: 



Reprints without covers, reimposed and re-made ready, saddle wire stitched : 



2 pages 4 pages 8 pages 12 pages 16 pages 



25 copies .55 .60 .65 .75 .90 



50 " .60 .70 .80 .95 $1.10 



100 " .70 .80 .95 $1.10 1.25 



additional 100 copies 



.20 .40 .60 .80 1.00 



100 covers with name of article and author printed on front coVer, ?2.00. 

 Additional covers, J cent each. 



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. $8.00* 



Semi-monthly numbers 25 



Monthlj' numbers 50 



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

 and addressed to E. W. Parker, Treasurer, Geological Surve}^, Washington, D. C, 

 to Williams & Wilkins Company, 2419-2421 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 Jotthnal does not exchange with other publications. 



Missing N'umbers will be replaced without charge provided that claim is made 

 within thirty days after date of the following issue. 



•Voluma I however, from July 19, 1911 to Dewmb?r 19, 1911 will bo seat for $3.00. Special ratea 

 »r« viven to rDombeta of »ci6ntiCc societies affiliated with the Aoademy. 



THE WAVERLY PRESS 



CA^TIMOftE, U.S. A, 



