IV CONTENTS OF VOL. XXI. FIFTH SERIES. 



Page 



Mr. W. A. Dixon on the Constitution of Acids 127 



Dr. G. Gore on the Reality of " Transfer-resistance " in Elec- 

 trolytic Cells 130 



Drs. W. Ramsay and S. Young on some Thermodynamical 



Eelations.— Part III * 135 



Mr. W. Sutherland on the Mechanical Integration of the Pro- 

 duct of two Functions 141 



Dr. T. Muir on the Differential Equation of a Conic 143 



Dr. Gr. Gore on the Relations of Surface-resistance at Elec- 

 trodes to various Electrical Phenomena 145 



Dr. E.J. Mills on the Numerics of the Elements. — Part II. 151 

 Notices respecting New Books : — 



Prof. Ketteler's Theoretische Optik : gegriindet auf das 



Bessel-Sellmeiersche Princip 158 



Proceedings of the Geological Society : — 



Mr. G. W. Ormerod on Old Sea-beaches at Teignmouth, 



Devon 160 



Prof. J. ~W. Judd on the Gabbros, Dolerites, and Basalts 



of Tertiary Age in Scotland and Ireland 160 



A simple way of explaining Clerk Maxwell's Electromagnetic 



Theory of Light, by Miss J. M. Chambers, B.Sc. 162 



On a new Apparatus for Measuring Electric Currents, by 



M. de Lalande 163 



On a new Secondary Element, by M. Kalischer 164 



NUMBER CXXX.— MARCH. 



Mr. Threlfall on the Theory of Explosions 165 



Prof. Spencer Umfreville Pickering on the Calibration and 



Standardizing of Mercurial Thermometers 180 



Prof. Osborne Reynolds on the Plow of Gases 185 



Prof. Silas W. Holman on the Effect of Temperature on the 



Viscosity of Air and Carbon Dioxide. (Plates I. & II.) . . 199 

 Dr. A. Woeikofs Examination of Dr. Croll's Hypotheses on 



Geological Climates , 223 



Mr. C.V. Boys on a Machine for Solving Equations. (Plate III.) 241 

 Mr. H. G. Madan on some Organic Substances of High Re- 

 fractive Power 245 



Mr. A. W. Clayden on the Determination of the Volume of 



Mercury in a Thermometer 248 



Dr. G. Gore on " Resistance " at the Surfaces of Electrodes 



in Electrolytic Cells 249 



Profs. W. E. Ayrton and J. Perry's note on the Paper on some 



Thermodynamical Relations by Prof. W. Ramsay and Dr. S. 



foung 255 



