VI CONTENTS OF VOL. XXIX. — THI11D SERIES. 



Page 

 Sir W. R. Hamilton on Quaternions ; or on a New System of 



Imaginaries in Algebra 326 



On the Determination of Carbonic Acid in Saline Compounds, 



by C. Brunner, Sen 328 



On the Action of Nitric Acid upon Cholic Acid, by A. Schlieper 330 

 On a new Property of Light exhibited in the Action of Chrysam- 



mate of Potash upon Common and Polarized Light, by Sir 



D. Brewster 331 



Influence of Nitrous Oxide Gas on Vegetation, by M. Vogel, Jun. 332 



Method of determining the quantity of Tungstic Acid 333 



Preparation of Chloric Acid, by M. Boettger 334 



Observations on Yest 334 



Meteorological Observations for August 1846 335 



Table 336 



NUMBER CXCV.— NOVEMBER. 



The Astronomer Royal on the Bands formed by the Partial 



Interception of the Prismatic Spectrum 337 



Sir David Brewster's Observations on the Law of Daily Tempe- 

 rature 341 



Mr. A. Connell's Observations on the Nature of Lampic Acid 353 

 Mr. W. R. Birt on the great Symmetrical Barometric Wave of 



November. (With a Plate.) 356 



Mr. W. J. Henwood's notices of the Superposition of certain 

 Minerals in some of the Metalliferous Deposits of Cornwall 



and Devon , * 359 



Dr. C. G. Page on the probable Conduction of Galvanic Elec- 

 tricity through Moist Air 361 



Mr. E. N. Horsford on the Value of different kinds of Vegetable 



Food, based upon the amount of Nitrogen 365 



Dr. A. Waller's Microscopic Observations on the Perforation of 

 the Capillaries by the Corpuscles of the Blood, and on the 

 Origin of Mucus and Pus-globules. (With a Plate.) .... 397 



Proceedings of the Royal Society 405 



On a new Metal, Pelopium, contained in the Bavarian Tantalite, 



by Prof. H. Rose 409 



On Ilmenium, a new Metal 417 



On Xanthic Oxide 419 



Tincture of Logwood as a Test for Bicarbonate of Lime 420 



On the Treatment of Osmiuret of Iridium 420 



Anhydrous Alcohol 421 



Action of Ferrocyanide of Potassium on the Tartrate and Citrate 



of Iron, &c 421 



Preparation of Valerianate of Zinc 422 



Meteorological Observations for September 1846 423 



Table 424 



