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1st : 



Series. 



2nd 



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3rd 



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4th 



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5th 



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6th 



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7th 



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8th 



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Contents of PROCEEDINGS, No. A 526. February, 1907. 



Price 5s. 6d. 



Page 



CALCIUM AS AN ABSORBENT OF GASES FOR THE PRODUCTION OF 



HIGH VACUA AND SPECTROSCOPIC RESEARCH. By Frederick Soddy, M.A., Lecturer in 

 Physical Chemistry in the University of Glasgow . . . . . . . . . . . • • . . . . . . . 429 



THE THEORY OF THE COMPOSITIONS OF NUMBERS.— PART II. By 



Major P. A. MacMahon. F.R.S., etc. (Abstract) 459 



THE THEORY OF PHOTOGRAPHIC PROCESSES, PART III: THE 



LATENT IMAGE AND ITS DESTRUCTION. (ABRIDGED ACCOUNT.) By S. E. Sheppard, 

 D.Sc, and C. E. K. Mees, D.Sc 461 



THE RELATION BETWEEN BREAKING STRESS AND EXTENSION IN 



TENSILE TESTS OF STEEL. By A. Mallock, F.R.S 472 



AN EXAMINATION OF THE LIGHTER CONSTITUENTS OF AIR. By 



Joseph Edward Coates, B.Sc. Wales 479 



THE PHOTO-ELECTRIC FATIGUE OF ZINC. By H. Stanley Allen, 



M.A., B.Sc, Senior Lecturer in Physics at King's College, London 483 



THE EFFECT OF TEMPERATURE ON THE ACTIVITY OF RADIUM 



AND ITS TRANSFORMATION PRODUCTS. By Howard L. Bronson, Ph.D 494 



INDEX 501 



TITLE, CONTENTS, ETC. 



OBITUARY NOTICES OF FELLOWS DECEASE^ 



: ^ 



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