The American Journal of Science 



Established by Benjamin Silliman in 1818. 



THE LEADING SCIENTIFIC JOURNAL IN THE UNITED STATES. 



Devoted to the Physical and Natural Sciences, with special refer- 

 ence to Physics and Chemistry on the one hand, and to Geology and 

 Mineralogy on the other. 



Editor: Edward S. Dana. 



Associate Editors : Professor George L. Goodale, John Trowbridge, 

 W. G. Farlow and Wm. M. Davis, of Cambridge ; Professors A. E. 

 Verrill, Henry S. Williams and L. V. PiRSSON, of New Haven ; Pro- 

 fessor G. F. Barker, of Philadelphia ; Professor Henry A. Rowland, 

 of Baltimore ; Mr. J. S. Diller, of Washington. 



Two volumes annually, in MONTHLY NUMBERS of about 80 pages each. 



This Journal ended its first series of 50 volumes as a quarterly in 1845; its 

 second series of 50 volumes as a two-monthly in 1870; its third series as a 

 monthly ended December, 1895. A Fourth Series commenced in January, 

 189G. 



Contributors should send their Articles two months before the time of issuing 

 the number for which they are intended. The title of communications and the 

 names of authors must be fully given. Notice is always to be given when com- 

 munications offered have been, or are to be, published also in other Journals. 



Thirty separate copies of each article will be furnished to the author free of 

 cost and without previous notice from him. They will be provided with a plain 

 cover (but with reference to volume and year). If the author orders separate 

 copies, they will be understood to be in addition to the thirty mentioned above, and 

 he will receive a bill for the extra expense involved, as also for that of a printed 

 cover (with title, etc.), when this is specially ordered. These charges will conform 

 to the following schedule; the rates will be somewhat increased if the article is 

 accompanied by plates. 



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Subscription price $6 per year, or 50 cents a number, postage prepaid in the 

 United States; $6 40 to foreign subscribers of countries in the Postal Union. A 

 few sets on sale of the first, second and third series at reduced prices. Ten-vol- 

 ume index numbers on hand for the second and third series. 



%^T Ten- volume Index, Yols. I-X, fourth series, price one dollar. Now ready. 



Address, 



THE AMERICAN JOURNAL OF SCIENCE, 



ISTew Haven, Conn. 



