VI CONTENTS OF VOL. XXI. 



Page 

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



the Labours of Continental Chemists (continued) 278 



Mr. John Phillips on the Occurrence of Shells and Corak in a 

 Conglomerate Bed, adherent to the face of the Trap Rocks of 



the Malvern Hills 2 88 



Prof. MacCullagh on the Dispersion of the Optic Axes, and of 



the Axes of Elasticity, in Biaxal Crystals 293 



Mr. G. G. Stokes's Remarks on a paper by Professor Challis, 

 *' On the analytical Condition of the Rectilinear Motion of 



Fluids" 297 



The Rev. H. Moseley on Conch yliometry 300 



Proceedings of the Geological Society 306 



London Electrical Society 310 



Chemical Society 313 



Bichloride of Hydrogen 320 



On the Action of Chlorides upon Protochloride of Mercury . . 320 



On Cinchovatina — a new Vegetable Alkali 323 



Preparation of pure Potash and Soda 324 



Detection of Iodine in Bromides 324 



Preparation of Ferrocyanic Acid and Ferridcyanide of Potassium 325 



Obituary 327 



Meteorological Observations for August 1842 327 



Table 328 



NUMBER CXXXIX. -NOVEMBER. 



Letter addressed by M . Edmond Becquerel to the Editors of the 

 Annales de Chimie et de Physique, in Reply to Mr. Daniell's 

 Letter to Mr. R. Phillips on the Constant Voltaic Battery, 



inserted in the Phil. Mag. for April 1842 329 



Prof. Grove's Remarks on a Letter of Professor Daniell con- 

 tained in the Philosophical Magazine for April 333 



Mr. H. Fox Talbot on the Iodide of Mercury 336 



On the Progress of Embryology in the Year 1840 337 



Mr. Earnshaw on the Theory of Molecular Action according to 



Newton's Law : in Reply to Professor Kelland 340 



The Rev. M. O'Brien's Additional Remarks upon a Com- 

 munication of Professor Kelland, published in the Phil. Mag. 



for May last 342 



Prof. Kelland's Vindication of himself against the Charges of 



the Rev. M. O'Brien 344 



Dr. Draper on certain Spectral Appearances, and on the disco- 

 very of Latent Light 348 



Dr. M. Barry's Note regarding the Structure of Muscle 351 



Dr. G. Fownes on the Preparation of Artificial Yeast 352 



Mr. H. Croft on some Salts of Cadmium 355 



