12mo, cloth, $1.25.
This work, commenced in the year 1850, and issued in the month of January, annually, embraces an enumeration and description of every important Invention, Discovery, or Scientific Theory, reported during the year.

Each volume is distinct in itself, and contains ENTIRELY NEW MATTER, with a fine portrait of some person distinguished for his attainments in science and art.
LAKE SUPERIOR; Its Physical Character, Vegetation, and Animals.

By L.AGASSIZ, and others.

One volume, octavo, elegantly Illustrated.

Cloth, $3.50.
THE PLURALITY OF WORLDS.
New Edition.