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



OPTICS, PHOTOGRAPHY, ETC. 



ABNEY, A TREATISE ON PHOTOGRAPHY. By Sir WILLIAM 

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BALY. SPECTROSCOPY. By E. C. C. BALY, F.I.C., Lecturer on 



Spectroscopy and Assistant Professor of Chemistry, University College, 

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

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 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 ABSORPTION SPECTRA. By C. E. 

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POLLOK. PRACTICAL SPECTROGRAPHIC ANALYSIS. By 



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SHEPPARD AND MEES. INVESTIGATION ON THE 

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

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VANDERPOEL. COLOUR PROBLEMS: A Practical Manual for 

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

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