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. gJ 



Haven; Professor O F. BARKER, of PMlrdelphia ; Professor JOSEPH S. AIMES 

 of Baltimore ; MR. J. S. DILLER, of Washington. 



I vu volumes annually, in monthly numbers of about 80 pages each. 



ser Th ; S ^° Ur i nal ended its first 8e "es of 50 volumes as a quarterly in 1845 ; its second 

 emhiisQ- ^ SaSa tw °- monthl y in 1870; its third series as a monthly ended Dec- 

 ker, i»y . A Fourth Series commenced in 1896. 



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«®-Teu-Volame Indexes, Vols. I-X XI-XX, fourth series, price one dollar. Address 



The American Journal of Science 

 New Haven, Conn. 



SECOND EDITION, NOVEMBER, igzo 



AMERICAN MEN OF SCIENCE 



A BIOGRAPHICAL DIRECTORY 

 EDITED BY J. HcKEEN CATTELL 



Price : Five Dollars, net, Postage paid 

 oa ddi THe SCIENCE PRESS 



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