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Page 



A DETERMINATION OF THE ELECTROMOTIVE FORCE OF THE 



WESTON NORMAL CELL IN SEMI-ABSOLUTE VOLTS. By A. Norman Shaw, M.Sc. (Abstract) 240 



ON THE MERCURY GREEN LINE X = 5461 RESOLVED BY GLASS AND 



QUARTZ LUMMER PLATES AND ON ITS ZEEMAN CONSTITUENTS. By J. C. McLennan 



and A. R. McLeod. (Plates 3 and 4) 243 



ON THE ELECTRIFICATION PRODUCED DURING THE RAISING OF A 



CLOUD OF DUST. By W. A. Douglas Rudge, M.A 256 



THE ELECTRICAL IGNITION OF GASEOUS MIXTURES. By Prof. W. M. 



Thornton, D.Sc, D.Eng. 272 



THE DISPERSION OF A LIGHT PULSE BY A PRISM. By R. A. Houstoun, 



M.A., Ph.D., D.Sc 298 



ON PROTECTION FROM LIGHTNING AND THE RANGE OF PROTEC- 

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 M.A ... .. .. 312 



