CONTENTS OF VOL. XXIII. V 



Page 



Scientific Memoirs, Part XII. — Mr. Babbage's Analytical En- 

 gine 234 



Meteorological Observations for July 1 843 239 



Table 240 



NUMBER CLIL— OCTOBER. 



Prof. C. G. Mosander on the new metals, Lanthanium and Didy- 

 mium, which are associated with Cerium ; and on Erbium 



and Terbium, new metals associated with Yttria. 241 



Prof. Wartmann's Experiments on the mutual relations of 



Electricity, Light and Heat 254 



Mr. Joule on the Calorific Effects of Magneto-Electricity, and 



on the Mechanical Value of Heat 263 



Mr. W. Brown on the Storms of Tropical Latitudes {concluded) 276 

 Dr. L. Playfair on the Changes in Composition of the Milk of a 



Cow, according to its Exercise and Food 281 



Mr. Drach's Places of Saturn computed by Hansen' s Formula 298 



Proceedings of the Geological Society 300 



Royal Astronomical Society 311 



On the non-precipitation of Lead from solution in Sulphuric 



Acid by Hydrosulphuric Acid, by M. Dupasquier 314 



Halo round the Sun, seen by Mr. Veall, Boston 316 



Crystallization of Octahedral Iodide of Potassium, by M. Bou- 



chardat 317 



On the presence of the Sulphate of Tin in the Sulphuric Acid 



of commerce, by M. Dupasquier 317 



On the Oxidizing Action of Chlorate of Potash on Neutral Sub- 

 stances 318 



New Books 319 



Meteorological Observations for August 1843 319 



Table 320 



NUMBER CLIII.— NOVEMBER. 



Dr. R. D. Thomson on the Results of the Panary Fermentation, 

 and on the Nutritive Values of the Bread and Flour of dif- 

 ferent countries 321 



Dr. J. M. Winn on the Production of Heat by the Contraction 

 of Elastic Tissue 326 



