iv CONTENTS Or VOL. XVI. FIFTH SERIES. 
Page 
On the Critical Point of Liquefiable Gases, by J. Jamin .... 71 
On the Liquefaction of Oxygen and the Consolation of Carbon 
Disulphkle and Alcohol, by Professors Sigin. von Wroblewski 
and K. Olszewski 75 
On the Liquefaction of Nitrogen and Carbonic Oxide, by Pro- 
fessors S. von AYroblewski and K. Olszewski 76 
NUMBER XCTHL— AUGUST. 
Dr. E. Obach's Improved Construction of the Movable-coil Gal- 
vanometer for determining Current-strength and Electromo- 
tive Eorce in Absolute Measure 77 
Mr. A. Tribe on the Influence of Current, Temperature, and 
Strength of Electrolyte on the Area of Electrification .... 90 
Prof. W. C. Rontgen on the Change in the Double Refraction 
of Quartz produced by Electrical Force 96 
Mr. L. Wright on Mica Films and Prisms for Polarizing-Pur- 
poses 109 
Prof. D. J. Korteweg on a General Theorem of the Stability of 
the Motion of a Viscous Fluid 112 
Mr. W. Ramsay on the Critical Point of Liquefiable Gases . . 118 
Mr. AV. AY". J. Xicol on the Molecular Volumes of Salt-Solu- 
tions 121 
Profs. W. E. Ayrton and J. Perry on the Measurement of 
the Electric Resistance of Liquids (Plate II.) 132 
Prof. J. D. Everett on Mr. Ferrel's Theory of Atmospheric 
Currents 142 
Mr. A. Gray on the Determination in Absolute Units of the 
Intensities of Powerful Magnetic Fields 144 
Proceedings of the Geological Society : — 
Prof. W. J. Sollas on the Estuaries of the Severn and its 
Tributaries 156 
Mr. J. S. Diller on the Geology of the Troad 157 
On Effects of Retentiveness in the Magnetization of Iron and 
Steel, by Prof. J. A. Ewing 159 
On Dry Charging-Piles, by Julius Elster and Hans Geitel . . 159 
NUMBER XCDL— SEPTEMBER. 
Mr. Werner Siemens on the Admissibility of the Assumption 
of a Solar Electric Potential, and its Importance for the Ex- 
planation of Terrestrial Phenomena 161 
Lord Rayleigh on Porous Bodies in relation to Sound 181 
