CONTENTS OF VOL, XXXI.— THIRD SERIES. Vll 



Page 



Proceedings of the Royal Society 372 



■ Cambridge Philosophical Society 376 



Royal Astronomical Society 380 



On the Gelatinous Substances of Vegetables 389 



Preparation of Protoxide of Tin 392 



On the Presence of Arsenic, Copper and Tin, in the Mineral 



Waters of Bavaria 392 



Solubility of Common Salt in Alcohol 393 



On some Improved Forms of Chemical Apparatus, by Thomas 



Taylor, Esq 393 



Preparation and Composition of Lignin 397 



Solubility of Chloride of Silver in Hydrochloric Acid 398 



Daubeny on Active and Extinct Volcanos 399 



Meteorological Observations for September 1847 399 



Table 400 



NUMBER CCX.— DECEMBER. 



Prof. M. Faraday on the Diamagnetic conditions of Flame and 

 Gases 401 



Prof. Zantedeschi on the Motions presented by Flame when' 

 under the Electro- Magnetic Influence 421 



Mr. T. Weddle on Asymptotic Straight Lines, Planes, Cones 

 and Cylinders to Algebraical Surfaces 425 



Mr. R. A. Couper on the Chemical Composition of the Sub- 

 stances employed in Pottery 435 



Sir D. Brewster on the Polarization of the Atmosphere 444 



Mr. A. Smith on the Hydx*ates of Nitric Acid 454 



Mr. F. Field on the Products of the Decomposition of Cuminate 

 of Ammonia by Heat 459 



Mr. J. J. Sylvester on the General Solution (in certain cases) 

 pf the equation j:'^-\-i/^-\-Az^ = Mxyz, &c 467 



Mr. W. De la Rue on Cochineal {Coccus Cacti). First Memoir 471 



NUMBER CCXI.— SUPPLEMENT TO VOL. XXXI. 



Mr. W. De la Rue on Cochineal (Coccus Cacti). First Memoir 

 (concluded) 481 



Sir D. Brewster on the Existence of Crystals with different pri- 

 mitive forms and physical properties in the Cavities of Mine- 

 rals ; with additional Observations on the New Fluids in 

 which they occur. (With a Plate.) 497 



Mr. L. Thompson's Observations on Chloric Acid and the 

 Chlorates 510 



