CONTENTS OF VOL. XXX. THIRD SERIES. V 



Page 

 The Rev. H. Moseley on a Machine for Calculating the Pro- 

 ducts, Quotients, Logarithms, and Powers of Numbers. (With 



a Plate.) 171 



Mr. J. G. Children on the use of a mixture of Spirit of Wine 



and Camphine, as a Light for Optical Purposes 179 



M. Encke on the newly-discovered Planet 181 



Mr. H. S. Warner on ^'—[ 185 



Prof. J. Henry on the Induction of Atmospheric Electricity on 



the Wires of the Electric Telegraph 186 



Mr. H. Spencer on the Form of the Earth no proof of Original 



Fluidity 194 



Proceedings of the Royal Society 196 



Royal Astronomical Society 207 



On Newton's Telescope at the Royal Society .' 211 



Formation of Sulphovinic Acid, by M. M. E. Millon 211 



On a Method of producing Lights and Shades in equal perfec- 

 tion in Daguerreotype Pictures, by MM. Belfield Lefevre and 



Leon Foucault 213 



Observations on the Experimentsof Messrs. Foucaultand Fizeau, 

 relative to the action of the Red Rays ujion Daguerreotype 



Plates, by M. Edmond Becquerel 214 



Researches on Mellon and its Compounds, by MM. Aug. Laurent 



and Ch. Gerhardt 218 



On the Preparation, Properties and Composition of Acetal, by 



M. Stas 220 



Presence of Sulphur in Metallic Substances struck by Lightning. 222 



On Chromate of Chromium, by M. Rammelsberg 223 



Meteorological Observations for January 1847 223 



Table 224 



NUMBER CCL— APRIL. 



Mr. J. p. Joule on the Effects of Magnetism, &c. upon the Di- 

 mensions of Iron and Steel Bars 225 



Prof. Challis's Second Report of Proceedings in the Cambridge 

 Observatory relating to the New Planet (Neptune) 241 



Mr. T. Hopkins on the Hourly Alterations of the Vapour At- 

 mospliere at Bombay. (With a Plate.) 246 



Dr. E. Ronalds's Remarks on the Extractive Material of Urine, 

 and on the Excretion of Sulj)hur and Phosphorus by the Kid- 

 ney.s in an unoxidized state 253 



Mr. A. Cayley's Note on a System of Imaginaries 257 



Mr. E. F. Tesclieniachcr on Gun- Cotton 258 



Prof. E. Wartmann's Third Memoir on Induction. (Witii a 

 Plate.) 261 



