CONTENTS OF VOL. XXIII. FOURTH SERIES. VII 



NUMBER CLVL— JUNE. 



Page 



Prof. Clausius on the Conduction of Heat by Gases 417 



Prof. Challis on the general Differential Equations of Hydrody- 

 namics 436 



Archdeacon Pratt's Calculation of the Undulation of an Unstif- 

 fened Roadway in a Suspension Bridge as a heavy Train 

 passes over it ; and Remarks upon the effect of a suspended 



Iron Girder in deadening the Undulation 445 



Mr. R. Sabine's remarks on a Paper by Dr. A. Matthiessen, 

 F.R.S., and C. Vogt, Ph.D., "On the Influence of Traces of 

 Foreign Metals on the Electric Conducting Power of Mercury. 457 

 Messrs. J. H. and G. Gladstone on Collyrite, and a native Car- 

 bonate of Alumina and Lime 461 



Prof. Schonbein on the Allotropic States of Oxygen ; and on 



Nitrification 466 



Mr. G. B, Jerrard's Supplementary Remarks on M. Hermite's 

 Argument relating to the Algebraical Resolution of Equa- 

 tions of the Fifth Degree 469 



Mr. A. Cayley on a Question in the Theory of Probabilities.. . 470 

 Dr. Atkinson's Chemical Notices from Foreign Journals .... 472 

 Proceedings of the Royal Society :— 



M. A. Schrauf on the Determination of the Optical Con- 

 stants of Crystallized Substances 478 



SirW. S.Harris on some new Phenomena of Residuary 

 Charge, and the Law of Exploding Distance of Electrical 



Accumulation on Coated Glass 484 



Proceedings of the Geological Society : — ■ 



Prof. Harkness on the Sandstones, and their associated 



Deposits, in the Valley of the Eden, &c 492 



Mr. A. Geikie on the Date of the Last Elevation of the 



Central Valley of Scotland 493 



Note on the Electricity developed during Evaporation and du- 

 ring Effervescence from Chemical Action, by Professor Tait 



and J. A. Wanklyn, Esq. 494 



On Chinese Astronomical Epochs, by Archdeacon Pratt. ..... 496 



NUMBER CLVIL— SUPPLEMENT TO VOL. XXIII. 



Mr. J. J. Waterston's Account of Observations on Solar Radia- 

 tion. (With a Plate.) 497 



Prof. Clausius on the Conduction of Heat by Gases 512 



Mr. W. Baker on the Metallurgy of Lead 534 



M. V. Regnault on an Air-Thermometer used as a Pyrometer 



in measuring High Temperatures. (With a Plate.) 537 



M . H. Karsten on the Oxidation of Gaseous Hydrocarbon-com- 

 pounds contained in the Atmosphere , 541 



