IV CONTENTS OF VOL. XXIII. 



Page 

 logy uniform and permanent, being the Report of a Com- 

 mittee for the consideration of the subject appointed by the 



British Association for the Advancement of Science 108 



Mr. Murchison on the Geological Structure of the Ural 



Mountains 124 



Proceedings of the Royal Irish Academy 135 



, . Royal Astronomical Society 145 



On the Variation of Gravity in Ships' Cargoes in different La- 

 titudes ' 154 



On Olivile, by Mons. A. Sobrero 156 



On some new Combinations of Cyanogen, by Mons. A. Meillet 157 



Meteorological Observations for June 1843 159 



Table 160 



NUMBER CLL— SEPTEMBER. 



Dr. Draper on the Decomposition of Carbonic Acid Gas and 

 the Alkaline Carbonates, by the Light of the Sun ; and on 

 the Tithonotype 161 



Dr. O'Shaughnessy on the use of Lightning-Conductors in 

 India, with reference to a passage in Mr. Snow Harris's 

 work on Thunder- Storms 177 



Mr. A. Kemp's new Process for preparing Cyanogen 179 



Dr. D. D. Owen, Mr. Lyell, Dr. Mantell, Mr. W. C. Redfield, 

 and Mr. J. H. Cooper on the Geology and Palaeontology of 

 North America, in abstracts of a series of papers recently 

 communicated to the Geological Society of London 180 



Mr. Bray ley on the Geographical Distribution of the Megathe- 

 rium 193 



Mr. W. G. Armstrong's Account of a Hydro-electric Machine 

 constructed for the Polytechnic Institution, and of some Ex- 

 periments performed by its means 194 



Letter from Dr. Hare on Professor Daniell's Defence of the 

 view taken by the latter of certain Electrolytic experiments, 

 which have been represented as proving the existence of a 

 compound radical (oxysulphion) in certain sulphates 202 



Mr. W Brown on the Storms of Tropical Latitudes 206 



Mr. J. D. Smith on the Composition of an Acid Oxide of Iron 

 (Ferric Acid) 217 



Experiments and Observations on Moser's Discovery, by Messrs. 

 Prater and Hunt 225 



Observations on M. Millon's Memoir on Nitric Acid, by M. 

 Gay-Lussac 23 1 



On the Action of Chlorides on Protochloride of Mercury, by 

 Mons. A. Larveque 233 



