Iron.—“We can highly recommend this little book.”

Manchester Guardian.—“Mr. Kimball has the too rare merit of describing first the facts, and then the hypotheses invented to limn them together.”

III.

HEAT AS A FORM OF ENERGY.

By Professor R. H. Thurston, of Cornell University.

In One Volume, small crown 8vo. Illustrated, 5s.

CONTENTS.

The Philosophers’ Ideas of Heat.Air and Gas Engines, their Work and their Promise.
The Science of Thermodynamics.The Development of the Steam Engine.
Heat Transfer and the World’s Industries.Summary and Conclusion.

OTHER VOLUMES IN PREPARATION.

Mr. WILLIAM HEINEMANN’S Announcements
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New Publications.