W CONTENTS. 



DECEMBER 1802. 



Engravings of the following Obje&s : 1. Mr. Murray's Improvement of 

 Woulfe's Apparatus} 2. Dr. Young's Apparatus for exhibiting the Colours 

 of thin Plates j 3. Prevoft on the Phenomena of Dew. 



I. Defcription of an Improvement of Woulfe's Apparatus, by which the 

 great Inconveniences of that Method of connecting the VefTels are obviated. 

 In a Letter from Mr. John Murray. - - Page 225 



II. Obfervations and Experiments upon oxigenized and hyperoxigenized Mu- 

 riatic Acid ; and upon fome Combinations of the Muriatic Acid in its three 

 States. By Richard Chenevix, Efq. F. R. S. M. R. I. A. From the Phi- 

 lofophical Tranfh&ions for 1802. _ . _ 228 



III. On the prefent State of the Britifli Mufeum. By a Correfpondent. 246 



IV. Of the Properties of the Earth Yttria, compared with thofe of Glu- 

 cinej of FolTils, in which the firft of thefe earths is contained} and of the 

 Difcovery of a new Subftance of a metallic nature (Tantalium.) By A* G. 

 Ekeberg. - - - - - - 251 



V. On the Probability that the Eruptions of Lunar Volcanos may reach the 

 Earth. By J. B. - - - - - - 255 



VI. Enquiries concerning the Dilatation of the Gafes and Vapors. Read to the 

 National Inftitute of France. By Cit. Gay Luflac. - - 257 



VII. New Theory of the Conftitution of mixed Gafes elucidated. In a Letter 

 from Mr. J. Dalton. - - 267 



VIII. A Method of increafing the Quantity of Light afforded by Candles, and 

 to obviate the Neceflity of fnuffing them. In a Letter from Mr. Ezekiel 

 Walker. ..... . 272 



IX. Defcription of a new Secret Lock. By J. B. Berard. Concluded from 

 page 222. - - - - - 276 



X. Defcription of Dr. Young's Apparatus for exhibiting the Colours of 

 thin Plates, by means of the Solar Microfcope. From the Journals of 

 the Royal Inftitution, 1. 241. - - - 283 



XI. Extract of a Letter from R. Chenevix, Efq. on the Magnetic Property 

 of Nickel. - - 286 



XII. On the unexpected Production of Sulphate of Magnefia. By J. Bollock, 

 M.D. - - - - - 288 



XIII. Abftraa of a Memoir on the Dew. By Cit. Benedia Prevoft. 290 

 Scientific News, Sec. Abftra6t of the late Experiments of ProfefTor Aldini on 



Galvanifm. — Examen, &c. Chemical Examination of a New Gas. — Notice 

 concerning certain peculiar Habits of the Shark and Pilot fifli.— Notice of a 

 new Metal. - - - - - - 298 to 30* 



