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CATALOGUE OF A COLLECTION OF EARLY PRINTED BOOKS IN THE 



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Contents of PROCEEDINGS, No. A 578. June, ion. 

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F 



THE IONISATION OF HEAVY GASES BY X-RAYS. Bv R. T. Beatty, M.A., B.E. 

 THE VARIATION OF IONISATION WITH VELOCITY FOR THE 



^-PARTICLES. By W. Wilson, M.Sc " .. 



THE ASSOCIATION OF LEAD WITH URANIUM IN ROCK-MINERALS, 



AND ITS APPLICATION TO THE MEASUREMENT OF GEOLOGICAL TIME. By Arthur 

 Holmes, A.R.C.S., B.Sc 



THE PATH OF AN ELECTRON IN COMBINED RADIAL MAGNETIC AND 



ELECTRIC FIELDS. By H. Stanley Allen, M.A., D.Sc 



ON THE DYNAMICAL NATURE OF THE MOLECULAR SYSTEMS WHICH 



EMIT SPECTRA OF THE BANDED TYPE. By Prof. E. T. Whittaker, Sc.D., F.R.S 



ON SOME MINERAL CONSTITUENTS OF A DUSTY ATMOSPHERE. By 



W. N. Hartley, D.Sc, F.R.S 



ON THE ABSOLUTE MEASUREMENT OF LIGHT : A PROPOSAL FOR AN 



ULTIMATE LIGHT STANDARD. By R. A. Hoi s,.,. M.A., Ph.D., D.Sc 



ON A METHOD OF MAKING VISIBLE THE PATHS OF IONISING 



PARTICLES THROUGH A GAS. By C. T. R. Wilson, M.A., F.R.S. (Plate 9) 



THE VACUUM TUBE SPECTRA OF MERCURY. By Frank Horton, D.Sc, Il.A. 

 THE SPECIFIC HEAT OF WATER. By W. R. Bousfield, M.A., K.C., and 



W. Eric Bousfield, B.A. (Abstract) 



MEMOIR ON THE THEORY OF THE PARTITIONS OF NUMBERS. 



PART V.— PARTITIONS IN TWO-DIMENSIONAL SPACE. By Major P. A. MacMahon, D.Sc, 

 F.R.S. (Abstract) .. .. 



AN OPTICAL METHOD OF MEASURING VAPOUR PRESSURES : VAPOUR 



PRESSURE AND APPARENT SUPERHEATING OF SOLID BROMINE. By Clive Cuthbertson 



SOLD BY HARRISON & SONS, 45, ST. MARTIN'S LANE, W.C. 



