JOHN TYNDALL'S WORKS.

ESSAYS ON THE FLOATING MATTER OF THE AIR, in Relation to

Putrefaction and Infection.

12mo. Cloth, $1.50.

ON FORMS OF WATER, in Clouds, Rivers, Ice, and Glaciers.

With 35 Illustrations. 12mo. Cloth, $1.50.

HEAT AS A MODE OF MOTION. New edition.

12mo. Cloth, $2.50.

ON SOUND: A Course of Eight Lectures delivered at the Royal

Institution of Great Britain.

Illustrated. 12mo. New edition. Cloth, $2.00.

FRAGMENTS OF SCIENCE FOR UNSCIENTIFIC PEOPLE.

12mo. New revised and enlarged edition. Cloth, $2.50.

LIGHT AND ELECTRICITY.

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LESSONS IN ELECTRICITY, 1875-'76.

12mo. Cloth, $1.00.

HOURS OF EXERCISE IN THE ALPS.

With Illustrations. 12mo. Cloth, $2.00.

FARADAY AS A DISCOVERER. A Memoir.

12mo. Cloth, $1.00.

CONTRIBUTIONS TO MOLECULAR PHYSICS in the Domain of Radiant Heat.

$5.00.

SIX LECTURES ON LIGHT. Delivered In America in 1872-'73.

With an Appendix and numerous Illustrations. Cloth, $1.50.

ADDRESS delivered before the British Association, assembled at

Belfast. Revised with Additions.

12mo. Paper, 50 cents.

RESEARCHES ON DIAMAGNETISM AND MAGNECRYSTALLIC ACTION, including the

Question of Diamagnetic Polarity. With Ten Plates.

12mo, cloth. Price, $1.50.

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