1978/45

₤21191

OF

NATURAL PHILOSOPHY:

OR,

A NEW THEORY OF PHYSICS,

FOUNDED ON

Gravitation,

AND APPLIED

IN EXPLAINING THE GENERAL PROPERTIES OF MATTER,

THE PHENOMENA

OF

CHEMISTRY, ELECTRICITY, GALVANISM,
MAGNETISM, & ELECTRO-MAGNETISM.

BY THOMAS EXLEY, A.M.

ASSOCIATE OF THE BRISTOL PHILOSOPHICAL AND LITERARY SOCIETY.

"Felix qui potuit rerum cognoscere causas."-VIRGIL.

LONDON:

PRINTED FOR LONGMAN, REES, ORME, BROWN, AND GREEN,

PATERNOSTER-ROW:

AND B. BARRY, BRISTOL.

1829.

HARVARD
UNIVERSITY
LIBRARY
SEP 13 1960

LONDON:

PRINTED BY T. S. CLARKE, 45, ST. JOHN-SQUARE.

TO

ADAM CLARKE, LL.D., F. A.S.,

MEMBER OF THE ROYAL IRISH ACADEMY; OF THE GEOLOGICAL
SOCIETY OF LONDON; OF THE ROYAL ASIATIC SOCIETY
OF GREAT BRITAIN; &c. &c. &c.

1

SIR,

Your high attainments in Literature, and your uniform endeavour to promote the acquisition and extension of Useful Knowledge, in the various departments of Science, have always yielded me much pleasure, and raised you high in my estimation, and in the estimation of many others; and, during the period of more than thirty years in which I have had the honour and happi