GEORGE ROUTLEDGE AND SONS, 



The Orbs of Heaven ; or, The Planetary and Stellai 

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Popular Astronomy ; or, The Sun, Planet, Satellites, 

 and Comets. With Illustrations of their Telescopic Appearance. 

 By O. M. MITCHELL. 2s. 64. 



The Story of the Peasant -Boy Philosopher 



Founded on the Early Life of FERGUSON, the Astronomer. Bj 

 HENRY MAYHEW. Illustrated. Cloth gilt, 3-r. 6d. 



The Wonders of Science ; or, The Story of Young 

 HUMPHREY DAVY, the Cornish Apothecary's Boy, who taughi 

 Himself Natural Philosophy. By HENRY MAYHEW. Illustrated. 

 Cloth gilt, y. 6d. 



The Book of Trades, and the Tools used in Them. By 

 One of the Authors of " England's Workshops." With numerous 

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Wonderful Inventions, from the Mariner's Compass to 

 the Electric Telegraph Cable. By JOHN TIMES. New Edition, 

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A Manual of Fret-Cutting and Wood-Carving. 

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The Laws of Contrast of Colours, and their Appli- 

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Geology for the Million. By MARGARET PLUES. Edited 

 by EDWARD WOOD, F.G.S. With 80 Illustrations. Fcap., 

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Scientific Amusements. Edited by Professor PEPPER. 

 100 Woodcuts, is., boards; is. 6d., cloth gilt. 



Electric Lighting. Translated from the French of Le 

 Comte Th. Du MONCEL by ROBERT ROUTLEDGE, B.Sc. (Lond.), 

 F.C.S., Author of "Discoveries and Inventions of the Nineteenth 

 Century," "A Popular History of Science," etc. With 76 Illus- 

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