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ESSAYS OX THE FLOATING MATTER OF THE AIR, 



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

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HEAT AS A MODE OF MOTION. New edition. 12mo. 



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

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FRAGMENTS OF SCIENCE FOR UNSCIENTIFIC PEO- 



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LIGHT AND ELECTRICITY. 12mo. Cloth, $1.25. 



LESSONS IN ELECTRICITY, 1875-'76. 12mo. Cloth, $1.00 



HOURS OF EXERCISE IN THE ALPS. With Illustrations. 

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FARADAY AS A DISCOVERER. A Memoir. 12mo. Cloth, 

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CONTKIBUTIONS TO MOLECULAR PHYSICS in the Do- 

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SIX LECTURES ON LIGHT. Delivered in America in 1872- 

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ADDRESS delivered before the British Association, assembled at Bel- 

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