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 WM. M. DAVIS 

 of Cambridge ; Professors A. E. VERRILL, HENRY S. WILLIAMS and L. V. PIRSSON, of New 

 Haven; Professor JOSEPH S. AIMES, 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 secoDd 

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

 ember, 1895. A Fourth Series commenced in 1896. 



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



The American Journal of Science 

 New Haven, Conn. 



SECOND EDITION 



AMERICAN MEN OF SCIENCE 



A BIOGRAPHICAL DIRECTORY 



EDITED BY J. flcKEEN CATTELL 



The ^wnd edition of the Directory extends to more than 600 pages and contains more than 5500 sketches 

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