CONTENTS OF VOL. XXIV. FOURTH SERIES. Vll 



Page 

 Mr. G. Gore on the Production of Vibrations and Sounds 

 by Electrolysis ; and on the Nature and Qualities of 



Voltaic Currents 40 1 



Dr. Matthiessen and M. von Bose on the Influence of Tem- 

 perature on the Electric Conducting Power of the Metals 405 

 On the Combustion of Gunpowder in vacuo, and in various Gaseous 



Media, by M. Bianchi 407 



Observations on the Solar Spectrum, by Dr. A. Weiss 407 



Mode of applying the Electric Light for Mining Purposes, by 

 MM. Dumas and Benoit 408 



NUMBER CLXIII.— DECEMBER. 



Archdeacon Pratt's Tests of the Truth of the Fluid Theory of the 



Figure of the Earth 409 



Dr. J. H. Gladstone on the Violet Flame of many Chlorides. . 417 

 L|r. Rankine on the Exact Form and Motion of Waves at and 



near the Surface of Deep Water 420 



Prof. Tyndall on the Absorption and Radiation of Heat by 



Gaseous Matter. — Second Memoir 422 



Prof. Sylvester on the Integral of the general Equation in Dif- 

 ferences 436 



Sir David Brewster on the Action of various Coloured Bodies 



on the Spectrum 441 



Prof. Potter on the Definition of the Temperature of Bodies, 



and on its Measurement by Thermometers 447 



Mr. G. B. Jerrard on some Objections of Mr. Cayley and 



Mr. Cockle 457 



Prof. Challis's Explanations of Phenomena of Light on the 



Hypothesis of Undulations 462 



Proceedings of the Royal Society : — 



Prof. Stokes on Internal Radiation 474 



Prof. Stokes on the Intensity of the Light reflected from 



or transmitted through a Pile of Plates 480 



Mr. C. Tomlinson on the Motions of Camphor on the Sur- 

 face of Water 490 



Proceedings of the Geological Society : — 



Dr. L. de Koninck on some Fossils from India 491 



Miss E. Hodgson on a Deposit containing Diatomacese, 



&c, in the Iron-ore Mines near Ulverston 492 



Capt. F. Applegath on the Geology of a part of the Masu- 



lipatam District 492 



Mr. J. G. Sawkins on the Association of Granite with the 



Tertiary Strata near Kingston, Jamaica 492 



On the Modifications which the Velocity of Light experiences 



in Glass, &c. under the influence of Heat, by M. H. Fizeau 492 

 On Magnetizing Steel Needles by the Current of a Leyden Jar, 



by Dr. Paalzow 494 



Note on the Limit of the Charge of Condensers, by M. Gaugain. 495 



