'MESSRS, LONGMANS' WORKS ON MEDICINE, SURGERY, ETC. 19 



OPTICS, PHOTOGRAPHY, ETC. 



ABNEY, A TEEATISE ON PHOTOGEAPHY. By Sir WILLIAM 

 DE WIVELESLIE ABNEY, K.G.B., F.R.S. With 134 Illustrations. 

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BALY. SPECTEOSCOPY. By E. 0. C. BALY, F.I.O., Professor of 

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DRUDE. THE THEOEY OF OPTICS. By PAUL DRUDE, Pro- 

 fessor of Physics at the University of Giessen. Translated from the 

 German by C. RIBORG MANN and ROBERT A. MILLIKAN, Professors 

 of Physics at the University of Chicago. With 110 Diagrams. 8vo, 15s. net. 



GLAZEBROOK. PHYSICAL OPTICS. By R. T. GLAZEBROOK, 



M.A., F.R.S. With 183 Woodcuts of Apparatus, etc. Crown 8vo, 6s. 

 MEES, AN ATLAS OF ABSOEPTION SPECTEA. By C. E. 



KENNETH MEES, D.Sc. Crown 8vo, 6s. net. 



POLLOK. PEACTICAL SPECTEOGEAPHIC ANALYSIS. By 



J. H. POLLOK, D.Sc. Crown 8vo. 



SHEPPARD AND MEES. INVESTIGATION ON THE 

 THEOEY OF THE PHOTOGEAPHIC PEOCESS. By S. 

 E. SHEPPARD, D.Sc. (Lond.), 1851 Exhibition Scholar of University 

 College, London, and C. E. KENNETH MEES, D.Sc. (Lond.). With 65 

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VANDERPOEL. COLOUE PEOBLEMS : A Practical Manual for 

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WRIGHT. OPTICAL PEOJECTION : A Treatise on the Use of the 



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