CONTENTS. 1^ 



DECEMBER, 1808. 



Eiigravings of the following Objects: 1. Mr. Massey's Patent Log: 2. ^r.' 

 Massey's Sounding Machine: 3. Diagrams illustrating the Problem respecting 

 the Radius of Curvature: 4. Implenients for the Construction of improved 

 Chemical Muffles. 



I. Answer to Mr. Barlow's Remarks on the Essay on Polygonal Numbers, By 

 J. Gough, Esq. - ^ - - - 241. 



II. Description and Use of a Sea Log, and Sounding Machine, invented by 

 Mr. Edward Massey, of Hanley, in Staffordshire - - 245 



III. Observations on the Problem respecting the Radius of Curvature. In a 

 Letter from W. Moore, Esq, »• -. - ^ 258 



IV. Essay on the Composition of Alcohol and of Sulphuric Ether. By The- 

 odore de Saussure ----- 259 



V. Description of an improved Mode of constructing Muffles for Chemical 

 Purposes. By Mr. Edmund Turrell, No. 40, Rawstorne-street, Gosw;eli- 

 street, Road , . - , - 273 



yi. Consideration on the State in which a Stratum of non-conducting Matter 

 must be, when interposed between Two Surfaces endued with opposite Elec- 

 tricities, By A. Avogadro, Corresponding Member of the Academy of Sci- 

 ences at Turin - - - - - 278 



VII. Account of an Experiment in which Potash calcined with Charcoal took 

 Fire on the Addition of Water, and Ammoniacal Gas was produced. In a 

 Letter from James Woodhouse, University of Philadelphia, &c. 290 



VIII. On the Advantages of employing Coal Gas for hghting small Manufac- 

 tories, and other Purposes. In a Letter from Mr. B. Cook - 291 



IX. Extract from a Letter to J. C. Delametherie, on Volcanic Substances. By 

 Lewis Cordier, Mine Engineer - , . ggg 



X. Letter to J. C. Delametherie on some Granatoid Lavas. By J. P. D'Aubu- 

 isson - - - . - . 299 



XI. An Examination, of a Stone of the Calcareous Species, called " Thunder 

 Pick." By Mr. J. Acton, of Ipswich, communicated by the Author 300 



XII. Remarks on a Review of Professor Vince's Essay on Gravitation. In a 

 Letter from the Author - - - - 305 



XIII. An Essay on the Sugar of Grapes. By Professor Proust - 306 

 Scientific News - - , - - - 315 

 iMeteprological Table - ? - , . , 320 



SUPPLEMENT 



