IV CONTENTS OF VOL. XVIII. FIFTH SERIES. 



Page 



Messrs. G. S. Turpin and A. W. Warrington on the Apparent 



Viscosity of Ice 120 



Messrs. B. Illing worth and A. Howard on the Thermal Rela- 



tionship between Water and certain Salts 123 



Mr. H. A. Miers on the Hemibedrism of Cuprite. (Plate VI.) 127 

 Prof. T. Carnelley on the Colour of Chemical Compounds, 

 chiefly as a Function of the Atomic Weights of their Con- 

 stituent Elements. — Part I. Inorganic Compounds 130 



Mr. H. M'Leod's Preliminary Notice of a new Sunshine- 

 Recorder ■ 141 



Mr. R. H. M. Bosanquet on Permanent Magnets. — 1 142 



Notices respecting New Books : — 



The Scientific Papers of James Prescott Joule 153 



Proceedings of the Geological Society : — 



Mr. T. Mellard Reade's Notes on Rock-fragments 

 from the South of Scotland imbedded in the Low-level 



Boulder-clay of Lancashire 155 



Mr. T. Mellaril Beade on Ripple-marks in Drift 156 



Mr. E. Wethered on the Structure and Formation of Coal 156 

 Mr. F. Rutley on Strain in connexion with Crystalliza- 

 tion and the Development of Perlitic Structure 157 



Mf. W. H. Penning's Sketches of South- African Geology. 

 No. 1. A Sketch of the High-level Coal-field of South 



Africa 158 



On the Electrolysis of Solid Glass, by E. Warburg 159 



On Phenomena of Diffraction in Moist Air, by M. Kissling. . 160 



NUMBER CXIL— SEPTEMBER. 



Profs. G. D. Liveing and J. Dewar on the Spectral Lines of 



the Metals developed by Exploding Gases 161 



Prof. H. W. Beetz on Normal Elements for Electrometric 



Measurements 173 



Mr. W. W. J. Nicol on the Molecular Volumes of Salt-Solu- 

 tions. — Part II. Water of Crystallization 179 



Prof. T. Carnelley on the Periodic Law, and the Occurrence of 



the Elements in Nature 194 



Prof. P. E. Chase on Harmonic Motion in Stellar Systems . . 200 



Mr. F. T. Edgeworth on a priori Probabilities 204 



Prof. J. Dewar on the Liquefaction of Oxygen and the Critical 



Volumes of Fluids 210 



Mr. C. V. Boys on a Magneto-electric Phenomenon 216 



Proceedings of the Geological Society: — 



Rev. E. Hill on the Rocks of Guernsey 225 



Dr. B. Koto on some Japanese Rocks 226 



Principal J. W. Dawson on the Geology of the Country 

 traversed by the Canada Pacific Railway, from Lake 

 Superior to the Rocky Mountains 227 



