MEMBER OF THE AMERICAN PHILOSOPHICAL SOCIETY, OF THE ACADEMY OF NA-
TURAL SCIENCES, PHILADELPHIA, THE AMERICAN ACADEMY OF ARTS

AND SCIENCES, MASSACHUSETTS, AND CORRESPONDING MEM-

BER OF THE POLYTECHNIC SOCIETY OF PARIS.

VOL. XVI.

NEW SERIES

PHILADELPHIA:

PUBLISHED BY THE FRANKLIN INSTITUTE, AT THEIR HALL;
P. THOMPSON, WASHINGTON CITY; G. & C. CARVILL & CO., NEW YORK, AND
MONROE & FRANCIS, BOSTON.

J. HARDING, PRINTER.

1835

Sci 1520.30