Vi CONTENTS OF VOL. XXX. — THIllD SERIES. 



Page 



Messrs. R. Porrett and E. F. Teschemacher on the Chemical 

 Composition of Gun-Cotton ; ^73 



Dr. A. Waller's Microscopic Examination of the Papillae and 

 Nerves of the Tongue of the Frog, with Observations on the 

 Mechanism of Taste. (With a Plate.) 277 



On the Behaviour of Metallic Zinc towards Solutions of Mercur3% 

 by H. Rose 290 



On the Composition of the Organic Alkalies, by M. Aug. Lau- 

 rent 293 



On the Change eifectcd in Hvdrated Peroxide of Iron when kept 

 in Water, by M. G. C. Wittstein 294 



On "\'illemite, by MM. Uelesse and Descloizeaux 295 



Solubility of Carbonate of Lime in Water containing Carbonic 

 Acid, by ^L Lassaigne 297 



Solubility' of Phosphate of Lime in Water saturated with Car- 

 bonic Acid, by M. Lassaigne 298 



Crystallized Bile . ■■ •• 298 



Singular Proiierty of Gun-Cotton mixture, by Prof. Draper . . 299 



On the Dehydration of Sulphate of Lime under various circum- 

 stances, by E. Millon 299 



Coffee as an Antidote to Acetate of Morphia 301 



On the Formation of Cylindrical Masses of Snow in Orkney, by 

 Charles Clouston, Esq 301 



Meteorological Observations for February 1847 303 



Table 304 



NUMBER ecu.— MAY. 



Sir David Brewster on the Knowledge of Distance given by Bi- 

 nocular Vision. (With a Plate.) 305 



Dr. de Haldat on the Universality of Magnetism 319 



Mr. R. Maddrell on the Metaphosphates 322 



Mr. H. C. Sorby on the Amount of Sulphur and Phosphorus in 



various Agricultural Crops 330 



Dr. H. Kolbe's Observations on the oxidizing power of Oxygen 



when disengaged by means of Voltaic Electricity 334 



Sir R. L Murchison on the Discovery of Silurian Rocks in 



Cornwall 336 



Dr. J. W. Draper on the Production of Light by Heat 345 



Prof. H. Rose on the Acid contained in the North American 



Columbite 360 



Mr. W. J. Kenwood's Abstract of Meteorological Observations 

 made during the year 1846 at Gongo Soco, in the interior of 



Brazil 361 



Proceedings of the Cambridge Philosophical Society 365 



Electrical Exi)criments, by Prof. Henry 368 



On the Examination of the Ashes of Organic Bodies, by H. Rose 369 



