IV CONTENTS OF VOL. XIII. FIFTH SERIES. 



Page 



Mr. E. H. M. Bosanquet on the Beats of Mistimed Conso- 

 nances 131 



Prof. B. Clausius on the Theoretic Determination of Vapour- 

 pressure and the Volumes of Vapour and Liquid 132 



Proceedings of the Geological Society : — 



Bev. W. Dowues on the Zones of the Blackdown Beds 



and their Correlation with those at Haldon 142 



Dr. C. Callaway on the Torridon Sandstone in relation 

 to the Ordovician Bocks of the Northern Highlands; 

 and on the Precambrian (Archaean) Bocks of Shropshire 143 

 Mr. J. A. Phillips on the Bed Sands of the Arabian 



Desert 144 



Mr. E. E. Berry's Analyses of five Bocks from the Charn- 



wood-Forest District 145 



Mr. T. M. Beade on the Chalk-Masses or Boulders in- 

 cluded in the Contorted Drift of Cromer, their Origin 



and Mode of Transport 145 



Prof. E. Hull on the two Types of Cambrian Beds of the 

 British Isles (the Caledonian and Hiberno-Cambrian), 

 and the Conditions under which they were respectively 



deposited 145 



Prof. E. Hull on the Devono-Silurian Formation 146 



On the Luminous Intensities of the Badiations emitted by 



Licandescent Platinum, by Prof. J. Violle 147 



An Application of Accidental Images (second note), by J. 



Plateau 149 



On some Consequences of Gauss's Principle in Electrostatics, 

 by M. Croullebois 151 



NITMBEB LXXX.— MABCH. 



Dr. J. Kerr's Electro-optic Experiments on various Liquids . . 153 



Messrs. Mills and Bicket's Besearches on Chemical Equiva- 

 lence. — I. Manganous and Nickelous Sulphates 169 



Messrs. Mills and Hunt's Besearches on Chemical Equiva- 

 lence. — II. Nickel ous and Cadmic Sulphates 177 



Dr. T. Carnelley on Chemical Symmetry, or the Influence of 

 Atomic Arrangement on the Physical Properties of Com- 

 pounds 180 



Mr. C. V. Bovs on Apparatus for Calculating Efficiency. 

 (Plate V.) 193 



Prof. E. Edlund on the Electrical Besistance of Gases 200 



Captain "W. de W. Abney on the Violet Phosphorescence in 

 Calcium Sulphide . . . .' 212 



Notices respecting New Books : — 



MM. Mascart and Joubert's Lemons sur 1'Electricite et le 

 Magnetisrne 214 





