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American Journal of Science and Arts 
(Founded by Professor Silbiman in 1818) ended its 1st Series of 50 volumes 
as a quarterly, in 1845, and its 2d Series of 50 volumes, as a two-monthly, 
in 1870. 
A Third Series in MONTHLY numbers commenced January, 1871. 
Devoted to Chemistry, Physics, Geology, Mineralogy, Natural History, 
Astronomy, Meteorology, etc. Two volumes, of over 450 pages each, pub¬ 
lished annually. 
Editors and Proprietors: Professors Dana and Silliman. Associate 
Editors: Professors Gray and Gibbs of Cambridge, and Newton, Johnson, 
Brush and Yerrill of Yale. 
Subscription price $6.00 a year, or 50 cents a number. A few complete 
sets on sale of the first and second series. 
Address 
DANA & SILLIMAN, New Haven, Ct. 
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