CONTENTS. Vll 



Page 



Preparation of Spongy Platina — Test of Nitric Acid 388 



Carboazotic Acid— Anhydrous Sulphite of Ammonia 389 



Separation of Selenium faom Sulphur — Stearic Acd ifromWax 



— Extrication of Heat by Compression of Gases 390 



Metal of Alumina— New Metals in the Uralian Platina 391 



New Alkali in Hemlock — Heat evolved by compressing Water 



— lodous Acid 392 



Manganesic Acid and Manganesate of Potash — Indelible Writ- 

 ing-ink 393 



Dracine, a new Substance found in Dragon's-Blood — Organic 



Remains of the Alluvium and Diluvium in Sussex 394< 



Aurora Borealis 395 



New Patents 396 



Meteorological Observations 397 



by Mr. Howard near London, 



Mr. Giddy at Penzance, Dr. Burney at Gosport, and Mr. 



Veall at Boston 399 



Calendar showing the times of Meeting of the Scientific Bodies 



of London for 1827-8 400 



NUMBER XXL— DECEMBER. 



M. Rudberg on the Dispersion of Light 401 



Mr. J. Taylor's Description of a Rain-gauge 406 



Mr. Gray's further Remarks on the Genus Chameleon, with 



the Description of an undescribed Species 408 



Mr. Gray's Monograph of the Genus Teredo of Linne, with 

 descriptive Characters of the Species in the British Museum 409 

 ~ Dr. Heineken's Meteorological Register kept at Funchal, in 



Madeira, in the Year 1826; &c 411 



Mr. Herapath on the Integration of Linear Differential Equa- 

 tions having Constant Coefficients and last Term any Func- 

 tion of the Indeterminate Quantity x 419 



M. Varvinsky on the Action of Iodine and Fluosilicic Acid . . 426 



Mr. Stokes on some new double Chromates 427 



Mr. R. Phillips on Nitric Acid, and on a peculiar Sulphate of 



Potash 429 



Mr. A. Aikin's Notes on the Geological Structure of Cader 



Idris 433 



New Books: — Mantell's "Illustrations of the Geology of 



Sussex" 439 



Proceedings of the Royal Society 449 



■ — Linn«ean Society 449 



' Geological Society 450 



Royal Geological Society of Cornwall . . . 457 



Mr. Lewthwaite's New Form of an Experiment in Electro-mag- 

 netism — Argillaceous Carbonate of Iron 459 



Berthierite, a new Mineral Species 460 



Sternbergite, a new Mineral Species 461 



Jalapia 462 



Glau- 



