SCIENTIFIC AMERICAN

A WEEKLY JOURNAL OF PRACTICAL INFORMATION, ART, SCIENCE, MECHANICS, CHEMISTRY, AND MANUFACTURES.

Vol. XXXVI., No. 8.
[New Series.]		$3.20 per Annum.
[POSTAGE PREPAID.]

NEW YORK, SATURDAY, FEBRUARY 24, 1877.

Scientific American.

ESTABLISHED 1845.

MUNN & CO., Editors and Proprietors.