CONTENTS OF VOL. XLIII. — FIFTH SERIES. V 



Page 

 Mr. W. Sutherland on the Spontaneous Change of Oxygen 



into Ozone and a Eemarkable Type of Dissociation 201 



H. Willy Wien on the Division of Energy in the Emission- 

 Spectrum of a Black Body , 214 



Dr. T. Muir on Lagrange's Determinantal Equation 220 



Dr. P. Zeeman on the Influence of Magnetism on the Nature 



of the Light emitted by a Substance 226 



Notices respecting New Books : — 



J. G. Vogt's Das Wesen der Elektrizitat und des 

 Magnetism us, auf Grund eines einheitlichen Substanz- 



begriffes < 239 



Proceedings of the Geological Society : — 



Dr. AVheelton Hind on the Subdivisions of the Carboni- 

 ferous Series in Great Britain, and the True Position 



of the Beds mapped as the Yoredale Series 240 



Prof. E. Kayser on Volcanic Bombs in the Schalsteins of 

 Nassau 240 



NUMBER CCLXIIL— APEIL. 



Mr. E. Eutherford on the Electrification of Gases exposed to 

 Eontgen Eays, and the Absorption of Eontgen Eadiation 



by Gases and Vapours 241 



Mr. George J. Burch on the Tangent Lens-Gauge 256 



Lord Bayleigh on the Passage of Waves through Apertures 



in Plane Screens, and Allied Problems 259 



Dr. G. J. Stoney : Discussion of a New Theorem in Wave 



Propagation 273 



Mr. Thomas Preston on the General Extension of Fourier's 



Theorem 281 



Mr. S. Eoslington Milner on the Variation of the Dissociation 



Coefficient with Temperature 2S6 



Mr. S. Eoslington Milner on the Heats of Vaporization of 



Liquids 291 



Notices respecting New Books : — 



H. von Helmholtz's Vorlesungen iiber theoretische 

 Physik. Band V. Electromagnetische Theorie des 

 Lichts, herausgegeben von Arthur Konig und Carl 



Bunge 305 



Prof. H. Ebert's Magnetic Eieids of Force. Part 1 306 



Iowa Geological Survey. Vol. V. Annual Beport, 



1895, with Accompanying Papers 307 



Autobiographical Sketch of James Croll, LL.D., E.E.S., 

 &c, with Memoir by James Campbell Irons 308 



