IV CONTENTS OF VOL. XIV. FIFTH SERIES. 



Page 



Mr. W. J. Lewis's Crystallographic Notes. (Plate III.) 119 



Prof. E. Clausius on the Dimensions of a Unit of Magnetism 



in the Electrostatic System of Measures 124 



M. H. Brongersma on Double Effraction, produced by Elec- 

 trical Influence, in Glass audBisulphide of Carbon. (Plate IV. 



fig. 5 a-h.) 127 



Notices respecting New Books :— 



(i) Mathematical Papers by William Kingdon Clifford ; 

 (ii) Mathematical Fragments, being Facsimiles of his 

 unfinished Papers relating to the Theory of Graphs, 



by the late W. K. Clifford 135 



Mr. T. Muir's Treatise on the Theory of Determinants, 

 with graduated sets of Exercises for use in Colleges 



and Schools . . 140 



Proceedings of the Geological Society : — 



Mr. H. J. Johnston-Lavis on the Comparative Specific 

 Gravities of Molten and Solidified Vesuvian Lavas . . 141 



Mr. G. Attwood on the Geology of Costa Eica 141 



Mr. S. V. Wood on the Newer Pliocene Period in England 142 

 Don M. E. de Castro on the Discovery of Triassic Fossils 



in the Sierra de Gador, Province of Almeria, Spain . . 146 

 Prof. C. Lapworth on the Girvan Succession. — Part I. 



Stratigraphical 147 



Mr. E. Wilson on the Rhsetics of Nottinghamshire .... 149 

 Dr. E. Schmidt on the Silurian and Cambrian Strata of 



the Baltic Provinces of Eussia 150 



Mr. T. F. Jamieson on the Cause of the Depression and 

 Re-elevation of the Land during the Glacial Period . . 151 

 On some Explosive Alloys of Zinc and the Platinum Metals, 



byH. Sainte-Claire Deville and H. Debray 152 



On the Reaction-current of the Electric Arc, by M. Jamin, with 



the assistance of M. G. Maneuvrier 154 



On the Motion of a Spherical Atom in an Ideal Gas, by 

 G. Liibeck 157 



NUMBER LXXXVIL— SEPTEMBER. 



MM. Elster and Geitel on the Electricity of Flame. (Plate IV. 



figs. 1-4) *. 161 



Lord Eayleigh on the Equilibrium of Liquid Conducting 



Masses charged with Electricity 184 



Lord Eayleigh on an Instrument capable of Measuring the 



Intensity of Aerial Vibrations 186 



Dr. C. R. A. Wright on the Determination of Chemical Affinity 



in terms of Electromotive Force. — Part VI 188 



Mr. W. Baily on an Integrating Anemometer. (Plate V.) . . 212 

 Rev. O. Fisher on the Effect upon the Ocean-tides of a 



Liquid Substratum beneath the Earth's Crust 213 



