VI CONTENTS 0¥ VOL. XXXVI. FOURTH SERIES. 



Page 

 Proceedings of the Royal Society : — 



Lieut. J. Herschel's observations of the Spectra of some of 



the Southern Nebulae 307 



Prof. E. Frankland on the Combustion of Hydrogen and 



Carbonic Oxide in Oxygen under great pressure 309 



Dr. J. H.Gladstone's Researches on Refraction-equivalents 311 

 Mr. J. C. Maxwell on a Method of making a Direct Com- 

 parison of Electrostatic with Electromagnetic Force ; 

 with a Note on the Electromagnetic Theory of Light. . 316 

 Second Note on the Laws of Induction, by MM. Jamin and 



Roger 317 



Third Note on the Laws of Induction, by MM. Jamin and Roger. 319 

 On the Diathermancy of Chloride of Potassium, by G. Magnus. 320 



NUMBER CCXLIV.— NOVEMBER. 



Mr. J. A. Phillips's Notes on the Chemical Geology of the 



Gold-fields of California 321 



Prof. Helmholtz on Discontinuous Movements of Fluids .... 337 

 Mr. W. H. Walenn on Unitation ; a novel Arithmetical Ope- 

 ration 346 



Prof. A. Cayley on Riccati's Equation 348 



Prof. E. Edlundon the New Electromotive Force in the Voltaic 



Arc 352 



Mr. J. Croll on Geological Time, and the probable Date of the 



Glacial and the Upper Miocene Period 362 



Prof. A. Cayley's Note on the Solvibility of Equations by means 



of Radicals 386 



Proceedings of the Royal Society : — 



Dr. W. H. Broadbent's attempt to apply Chemical Prin- 

 ciples in explanation of the Action of Poisons 388 



Mr. W. Huggins on the Spectrum of Comet II., 1868 . . 393 



On Stellar Spectra, by Father Secchi 394 



On a Thermo-rheometer, by M. Jamin 396 



Investigations on obscure Calorific Spectra, by M. Desains . . 398 



NUMBER CCXLV.— DECEMBER. 



Prof. G. G. Stokes on the Communication of Vibration from a 

 Vibrating Body to a surrounding Gas 401 



