CONTENTS OF VOL. XX.— FOURTH SERIES. V 



Page 

 The Rev. S. Earnshaw on a new Theoretical Determination of 



the Velocity of Sound 186 



Mr. J. Spiller's Photographic Observations of the Solar Eclipse, 



July 18, 1860 192 



Archdeacon Pratt on the Thickness of the Crust of the Earth. 194 

 Dr. Atkinson's Chemical Notices from Foreign Journals. ...... 196 



Mr. J. J. Sylvester on Poncelet's approximate linear Valuation 



of Surd Forms 203 



Proceedings of the Royal Society : — 



Mr. J. P. Gassiot on Vacua as indicated by the Mercurial 



Siphon-gauge and the Electrical Discharge 223 



Dr. A. H. Hassallon the frequent occurrence of Phosphate 



of Lime, in the crystalline form, in Human Urine .... 224 

 Dr. Harley on the Saccharine Function of the Liver .... 224 

 Drs. De la Rue and Miiller on the Resin of the Ficus 



rubiginosa, and a new Homologue of Benzylic Alcohol. . 225 

 Mr. P. Griess on a new Method of Substitution ; and on 

 the formation of Iodobenzoic, Iodotoluylic, and Iodo- 



anisic Acids 226 



Mr. B. Stewart on an Instrument combining in one a 



Maximum and Minimum Mercurial Thermometer .... 227 

 Messrs. Crace-Calvert and Lowe on the Expansion of 



Metals and Alloys 230 



Prof. W. Thomson on the Measurement of the Electro- 

 static Force produced by a Daniell's Battery 233 



Proceedings of the Geological Society : — 



M. E. Lartet on the co-existence of Man with certain 



Extinct Quadrupeds 239 



Mr. W. P. Jervis on certain Rocks of Miocene and Eocene 



age in Tuscany 240 



Dr. Falconer on the Ossiferous Caves of the Peninsula of 



Gower in Glamorganshire 241 



On the Periodicity of the Solar Spots, and induced Meteorolo- 

 gical Disturbances, by Robert P. Greg, Esq 246 



On the Phenomena of Heat which in certain cases accompanies 



the Vibratory Motion of Bodies, by M. Le Roux 247 



On the Density of Ice, by M. L. Dufour 248 



NUMBER CXXXIII.— OCTOBER. 



Dr. Gladstone on the Electric Light of Mercury. (With a 

 Plate.) 249 



Mr. M. Ponton's Further Researches regarding the Laws of 

 Chromatic Dispersion 253 



Mr. T. Tate on a new Self-registering Mercury Barometer. 

 (With a Plate.) 263 



Mr. R. P. Greg on the Periodicity of the Solar Spots 271 



M. Regnault on the Elastic Force of Vapours 275 



