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. 4 

 Associate Editors: Professor GEORGE L. GOODALE, JOHN TROWBRIDGE, W. G. FARl.OW and WM. n. DAVliS 

 of Cambridge ; Professors A. E. VERRILL, HENRY S. WILLIAMS and L. V. PIRSfeON, of Ne* 



of Batlmore; riR *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 Dec- 

 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. 

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



The American Journal of Science 

 New Haven, Conn. 



LAMARCK 



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_*«y Of the aDOVft nrina H«f D o^f " t^ r 



Science 



mrnal, established in^883, 



of Sciencef pubS^rig\nal articles 



,nd notes on the progress of the different branches of 

 cience, the proceedings of scientific societies and 

 ' lies, reviews of scientific books and articles, 

 inarv accounts of researches and full discussion 



The Popular Science Monthly 



An illustrated magazine, established in 1872, devoted 

 to the diffusion of science, publishing articles by 

 leading authorities in ail departments of pure and 

 applied science, including the a - 



- " 



THE SCIENCE PRESS 



