VI CONTENTS. 



Mr. De la Beche's Notes on the Geographical Distribution of 

 Organic Remains contained in the Oolitic Series of the Great 

 London and Paris Basin, and in the same Series of the South 



of France [continued) 250 



Dr. Bostock on the spontaneous Purification of Thames Water 268 



Prof. Encke on the Elements of the Planet Ceres 271 



Mr. J. Prideaux on the Composition of Chloride of Barium, 

 Nitrate of Lead, and Phosphoric Acid j and on the Atomic 



Weights of Iodine and Bromine 276 



Mr. Sharpe's Account of some Optical Experiments 281 



Dr. Turner on a Specimen of Varvicite from Ihlefeld 284 



Mr. Bevan's Results of some Experiments on the actual Force 



of Draught of Carriages upon common Roads 286 



Proceedings of the Royal Society 287 



. . Linnaan Society 288 



__^_- Geological Society 289 



.. — at the Friday-Evening Meetings of the Royal In- 

 stitution of Great Britain 315 



Correction in Mr. Phillips's Paper — Action of Metals on Water 



and Carbonic Acid, &c. — Glacial Acetic Acid 317 



Meteorological Observations 318 



NUMBER XLI— MAY. 



Rev. Dr. Buckland's Letter on the Discovery of Coprolites in 



North America 321 



Mr. Kenwood's Observations on some late Statements by Mr. 



Farey respecting the Steam-Engines of Cornwall 323 



Mr. Challis's General Considerations respecting the Propa- 

 gation of Motion through Elastic Mediums ; with Remarks 



on a former Communication 325 



Prof. Encke on the Conversion of Right Ascension and Decli- 

 nation into Longitude and Latitude, and vice versa 330 



Mr. De la Beche's Notes on the Geographical Distribution of 

 Organic Remains contained in the Oolitic Series of the Great 

 London and Paris Basin, and in the same Series of the South 



of France [continued) 334; 



M. Utzschneider on M. Guinand's Glass for Telescopes .351 



Proceedings of the Royal Society 353 



LinntEan Society 357 



. Geological Society 358 



. . Astronomical Society 361 



.. Royal Academy of Sciences of Paris 376 



Discussions in the French Royal Academy of Sciences, between 

 M. Geoffroy-Saint-Hilaire and the Baron Cuvier, respecting 

 the Unity of Organization in Animals, and the Analogies by 



which they are connected 379 



M. Gay- 



