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A SYSTEM

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OF

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NATURAL PHILOSOPHY:

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IN WHICH THE

PRINCIPLES OF MECHANICS,

IYDROSTATICS, HYDRAULICS, PNEUMATICS, ACOUSTICS, OPTICS,
ASTRONOMY, ELECTRICITY, MAGNETISM, STEAM ENGINE,

AND ELECTRO-MAGNETISM,

ARE

FAMILIARLY EXPLAINED,

AND ILLUSTRATED BY

MORE THAN TWO HUNDRED ENGRAVINGS.

TO WHICH ARE ADDED,

QUESTIONS FOR THE EXAMINATION OF PUPILS.

DESIGNED FOR

THE USE OF SCHOOLS AND ACADEMIES.

BY J, L. COMSTOCK, M. D.
Author of Introduction to Mineralogy, Elements of Chemistry, Introduction to

Botany, Outlines of Geology, Outlines of Physiology, Nat. Hist. Birds, &c.

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ENTERED,
According to act of Congress, in the year 1838, by

J. L. COMSTOCK, a the Clerk's Office of the District Court of Connecia

Stereotyped by
Francis F. Ripley.

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The necessity of reprinting the Author's Natural Philosophy, has given him an opportunity of reviewing and correcting the whole, and of making many changes, which could not have been done on stereotype plates. In addition to these corrections, he has added about forty pages of letterpress, and more than twenty new cuts, chiefly on the subjects of the Steam Engine and Electro-Magnetism. Both these subjects the Author has taken great pains to explain and illustrate, in such a manner as to make them understood by the pupil. The mechanical principles on which this engine acts, it will be allowed, have been comprehended only by a very few ; while the subject of electromagnetism has become exceedingly interesting, on account of recent attempts to make its force a motive power. The whole work has been newly stereotyped; and on all accounts, therefore, it is believed, will be much more acceptable to the public than formerly.

J. L. C. Hartford, Ct., May, 1838.

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