The Advance of Science in the Last Half-Century

by Thomas Henry Huxley

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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CHARLES DARWIN'S WORKS.

ORIGIN OF SPECIES BY MEANS OF NATURAL SELECTION, OR THE PRESERVATION OF FAVORED RACES IN THE STRUGGLE FOR LIFE. From sixth and last London edition. 2 vols., 12mo. Cloth, $4.00.

DESCENT OF MAN, AND SELECTION IN RELATION TO SEX. With many Illustrations. A new edition. 12mo. Cloth, $3.00.