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GENERAL ASTRONOMY. By H. Spencer Jones, M.A., B.Sc. Senior 

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ASTRONOMICAL DISCOVERY. By H. H. Turner, D.Sc, F.R.S., 



Savilian Professor of Astronomy in the University of Oxford, xii + 225 pages, 

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ISOTOPES. By F. W. Aston, D.Sc, M.A., F.R.S., Fellow of Trinity 

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IONS, ELECTRONS, AND IONIZING RADIATIONS. By J. A. 



Crowther, M.A., Sc.D., University Lecturer in Physics as applied to Medical 

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THE BECQUEREL RAYS AND THE PROPERTIES OF RADIUM. 



By Lord Rayleigh, F.R.S., formerly Professor of Physics at the Imperial College of 

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AN INTRODUCTION TO THE THEORY OF OPTICS. By Sir 



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THE DYNAMICAL THEORY OF SOUND. By Horace Lamb, D.Sc, 

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[New Edition in Preparation. 



COLOUR VISION. A Discussion of the Leading Phenomena and 

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AERONAUTICS IN THEORY AND EXPERIMENT. By W. L. 



Cowley, A.R.C.S., D.I.C., and H. Levy, M.A., B.Sc, F.R.S.E., Assistants at the 

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NAVIGATION NOTES AND EXAMPLES. By Instructor Captain 

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AIR NAVIGATION NOTES AND EXAMPLES. By Instructor 

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A TEXT- BO OK OF PHYSICS. By R. S. Willows, M.A. (Camb.). 

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 Second Edition, Sixth Impression, viii + 520 pages, with 320 diagrams. 

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HEAT. By W. J. R. Calvert, M.A., Harrow School, viii + 344 pages, 

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ELECTRICITY AND MAGNETISM. By C. E. Ashford, M.A., 

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