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Contents of PROCEEDINGS, No. A 571. October, 1910. 
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‘Page. G 
THE ORIGIN AND cheyen ie RIPPLE- MARK. es Mies HERTHA AYRTON. 3 
(Plates 3 and 4) eae 286 2 At 
THE ABSORPTION ‘SPECTRA OF SULPHUR VAPOUR AT. ‘DIFFERENT ee 
TEMPERATURES AND PRESSURES AND THEIR RELATION TO THE~- MOLECULAR ay ee 
COMPLEXITY OF THIS ELEMENT. -By J. Ivon Grauam, B.Sc. (Lond.), A.R.C.Sc.I. (Plated)... 311 
A DETERMINATION OF THE RATIO OF MASS TO WEIGHT FOR A _ os 
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ON THE SPONTANEOUS CRYSTALLISATION AND THE MELTING AND $i 
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AZOBENZENE AND BENZYLANILINE. By Miss F. Isaac 
ON THE IMPROBABILITY OF A RANDOM DISTRIBUTION OF THE te 
STARS IN SPACE. By F. W. Dyson, M.A., F.R.S. 6 
THE CONDITIONS NECRO os FOR DISCONTINUOUS MOTION. IN 
GASES. . By G. I. Taytor, B.A. fs BA 
ON THE RADIUM CONTENT OF BASALT. By the Hoa: R. ag cee F, R. S. 
MEASUREMENTS OF THE RATE AT WHICH HELIUM IS PRODUCED 
IN THORIANITE AND PITCHBLENDE, WITH A MINIMUM ESTIMATE OF THEDR 
ANTIQUITY. By the Hon. R. J. Strutt, F.R.S. Ee hf ee him. to 
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