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 nine- 

 teenth of each month, or during the summer may appear on the nineteenth only, 

 as double numbers. Although the first volume begins with this issue it will end 

 with 1911 and subsequent volumes will correspond to calendar years. 



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

 (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 be made for 

 printing from a suitable cut supplied with the manuscript. 



Proof. — No proof will be sent to authors. They are supposed to submit their 

 manuscripts in final form and the editors will exercise reasonable care in seeing 

 that copy is accurately 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, 50 copies $.25, 100 copies $.50 



As the author will not see proof, his request for extra copies or reprints 

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

 attached to the first page of his manuscript. 

 Rates of Subscription are as follow*: 



To members of the Academy For annual dues 



To members of the affiliated scientific societies $2.50 a year 



To an affiliated society offering, at one time, subscriptions 

 for 25 or more copies, mailable to separate addresses if 



desired 2.00a year 



To all others 6.00 a year 



Single numbers 25 



Double numbers 50 



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

 and addressed to Dr. Arthur L. Day, Treasurer, Geophysical Laboratory, Wash- 

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

 Md. 



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



Missing Numbers will be replaced vv ithout charge provided that claim is made 

 within thirtjr days after date of the following issue. 



Printed by Williams & Wilkins Company, Baltimore, Md. 



