Vi CONTENTS. 



Page 

 Mr. M. J. Roberts on the Cause of the Production of Daguer- 

 reotype Pictures 301 



New Books : — Griffin's System of Crystallography. — Dr. Kane's 



Elements of Chemistry 302 



Proceedings of the Royal Society 307 



Geological Society 311 



. Cambridge Philosophical Society 318 



Scientific Works lately published 319 



Meteorological Obsers^ations for FebruaiT 1841 319 



Table ". 320 



NUMBER CXVIII.— MAY. 



Mr. Airy's Remarks on Professor Challis's Reply to Mr. Airy's 

 Objections to the Investigation of the Resistance of the 



Atmosphere to an Oscillating Sphere 321 



Mr. W. G. Armstrong on the Electrical Phcenomena attending 

 the Efflux of Condensed Air, and of Steam generated under 



Pressure 328 



Mr. W. Kemp on the supposed Moraines of Ancient Glaciers 



in Scotland, introduced by a Letter from Mr. J. E. Bowman 337 

 Mr. R. Potter's Examination of the Phaenomena of Conical Re- 

 fraction in Biaxal Crystals 343 



Prof. A. Connel on the Voltaic Decomposition of Aqueous and 



Alcoholic Solutions (concluded) 353 



Mr. H. Wedgvvood on the Natural Arrangement of the Con- 

 sonantal Sounds 363 



Messrs. W. Francis and H. Croft's Notices of the Results of the 



Labours of Continental Chemists (conti?iued) 367 



Mons. F. de la Provoslaye on the Isomorphism of Oxamethane 



and Chloroxaraethane 372 



Mr. T. Weaver on the Composition of Chalk Rocks and Chalk 

 Marl by invisible Organic Bodies : from the Observations of 



Dr. Ehrenberg 375 



Mr. J. Prideaux's Notice of an undescribed Native Subsulphate 



of Iron from Chili 397 



Proceedings of the Geological Society 398 



London Electrical Society 409 



— Chemical Society of London 410 



New Books : — A Collection of Letters illustrative of the Pro- 

 gress of Science in England from the Reign of Queen 



Elizabeth to that of Charles the Second 411 



Orthodox Geography 414 



Cumyle — Oil of Cummin 415 



Meteorological Observations for March 1841 415 



lable 416 



