CONTENTS OF VOL. XV. — FOURTH SERIES. V 



Page 

 Mr. S. Tebay on the Law of Bode, with a remarkable coinci- 

 dence in reference to the Satellite System of Jupiter ; and 



on the Rotation of a Heavenly Body 206 



Mr. J. J. Waterston on the Evidence of a Graduated DitFer- 

 ence between the Thermometers of Air and of Mercury 

 below 100° C. derived from M. Regnault's observations on 



the Tension of Aqueous Vapour. (With a Plate.) 212 



Proceedings of the Royal Society: — 



Dr. Hofmann and M . Cahours on a New Class of Alcohols. 226 

 Prof. Bunsen and Dr. Roscoe's Photo-chemical Researches. 230 

 Proceedings of the Geological Society : — 



Dr. Daubeny on the Evolution of Ammonia from Volcanos. 233 



Prof. Haughton on the Granites of Ireland 234 



Dr. Bigsby on the Classification of the Palaeozoic Strata 



of the fcjtate of New York 234 



Un the Intluence of Musical Sounds on the Flame of a Jet of 



Coal-gas, by Juhn Leconte, M.D 235 



Un a New Source of Electrical Excitation, by Mrs. Elisha Foote. 239 



NUMBER C— APRIL. 



Mr. W. S. Jevons on the Forms of Clouds. (With a Plate.). . 241 

 i'rof. Callan's Description of a Contact Breaker superior to any 

 hitherto made, and of certain Effects of a Condenser on the 



Action of various kinds of Contact Breakers 255 



Mr. F. M. Jennings on the Lakes and Rivers of Damascus. . . . 260 



Prof. Rogers's Experiments on some Sonorous Flames 261 



M. Poiusot on the Percussion of Bodies {continued) 263 



Mr. J.N. Hearder on the Difference in the Amount of Elec- 

 tricity developed by equal surfaces of Cylinder and Plate 



Electrical Machines 290 



Dr. Atkinson's Chemical Notices from Foreign Journals 299 



Prof. Rankiue on the Elasticity of Carbonic Acid Gas 303 



Dr. Joule on the Intensity of Light during the recent Solar 



Eclipse "J^^ 



i'roceedings of the Royal Society : — 



Mr. A. Cayley on a Class of Dynamical Problems ...... 306 



Mr. W. Hopkins on the Conductive Powers of various Sub- 

 stances '^^^^ 



Mr. E. J. Cooper on the Perihelia and Nodes of the Planets. 316 

 i'luceedings of the Geological Society : — 



Mr. C. J. F. Bunbury on a remarkable fossil Specimen 



belonging to the Genus Neuropteris 318 



Prof. Huxley on Ccp/iulasjiis and I'tera.^pis 319 



Prof. Huxley on a New tspecics of I'lcaiusuurus 320 



l)v. C. i'oiljes on the Coal found south of Cuucepcion, in 

 fcjoutiiern Chili «i21 



