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Contents of PROCEEDINGS, No. A 508. May, 1905. 



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Page 



ON THE RADIO-ACTIVE MINERALS. By the Hon. R.J. Strutt, Fellow of Trinity 



College, Cambridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 



THE RATE OF TRANSMISSION OF THE GUATEMALA EARTHQUAKE, 



APRIL 19, 1902. By R. D. Oldham 102 



A DETERMINATION OF THE AMOUNTS OF NEON AND HELIUM IN 



ATMOSPHERIC AIR. By Sir William Ramsay, K.C.B., F.R.S Ill 



A NEW RADIO-ACTIVE ELEMENT, WHICH EVOLVES THORIUM 



EMANATION. PRELIMINARY COMMUNICATION. By O. HAHN, Ph.D 115 



ON THE SPECTRUM OF SILICON ; WITH A NOTE ON THE SPECTRUM 



OF FLUORINE. By Joseph Lunt, B.Sc, F.I.C. (Plate 2.) 118 



THE BASIC GAMMA-FUNCTION AND THE ELLIPTIC FUNCTIONS. 



By the Rev. F. H. Jackson, R.N ... .. 127 



FURTHER RESEARCHES ON THE TEMPERATURE CLASSIFICATION 



OF STARS. No. 2. By Sir Norman Lockyek, K.C.B., Hon. LL.D. (Glasgow), Hon. Sc.D. (Camb.), 

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ON SOME CONTINUOUS OBSERVATIONS OF THE RATE OF DISSIPA- 

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ATMOSPHERIC ELECTRICITY IN HIGH LATITUDES. By George; C. 



Simpson, B.Sc. (Abstract.) .. .. 160 



NOTE ON FLUORESCENCE AND ABSORPTION. By John Butler Burke, 



M.A 165 



THE DIRECT SYNTHESIS *OF AMMONIA. By Edgar Philip Perman, D.Sc, 



Assistant Professor of Chemistry at University College, Cardiff . . . . . . . . . . . . . . . 167 



DETERMINATION OF VAPOUR-PRESSURE BY AIR-BUBBLING. By Edgar 



Philip Perman and John Hughes Davies 17* 



ON THE OBSERVATIONS OF STARS MADE IN SOME BRITISH STONE 



CIRCLES.— PRELIMINARY NOTE. By Sir Norman Locky'er, K.C.B., F.R.S., LL.D., Sc.D. .. 17T 



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