AMERICAN JOURNAL OF SCIENCE AND ARTS

(Founded by Professor SILLIMAN 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, published annually.

Editors and Proprietors: Professors DANA and SILLIMAN. Associate Editors: Professors GRAY and GIBBS of Cambridge; NEWTON, JOHNSON, BRUSH and VERRILL of Yale; and MAYER of Stevens Institute, Hoboken.

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.

New Haven, 187