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 reference 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 

 of Cambridge ; Professors A. E. VERRILL, HENRY S. WILLIAMS and L. V. P1RSSON. ol 

 Haven; Professor G. F. BARKER, of Philadelphia; Professor JOSEPH S. AIMES, 

 of Baltimore; rtR. 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 

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

 ember, 1895. A Fourth Series commenced in 1896. 



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

 $6.25 to Canada; $6.40 to countries in the Postal Union. Back numbers at reduced prices. 

 8@-Ten- volume Indexes, Vols. I-X, XI-XX, fourth series, price one dollar. Address 



The American Journal of Science 

 New Haven, Conn. 



rr 



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The American Naturalist 



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