CONTENTS. Hi 



NOVEMBER 1802. 



Engravings of the following Obje&s : 1. Cit. Gay Luflac's Apparatus for de- 

 termining the Expanfions of the Gafes by Heat j 2. The Indian Hand Mill ; 

 3. and 4. The Parts and Structure of a Secret Lock, which can be opened 

 only by the Proprietor. By Cit. J. B. Berard. 



I. Letter from Thomas Young, M. D. F. R. S. In Reply to Mr. Gough't 

 Letter, at Page 36 of the prefent Volume. On the Phenomena of Sound. 



Page 145 



II. On the Galvanic EfFe£t of very minute Particles of Zinc and Copper in 

 Water. In a Letter from Mr. William Wilfon. - - 147 



III. On th« Colours obtained from Metallic Oxides, and fixed by Means of 

 Fufion on different Vitreous Bodies. By Alex. Brongniart, Director of th« 

 National Manufactory of Porcelain at Sevres, Engineer of Mines, &c. 14$ 



IV. Experiments and Obfervations on certain Stony and Metalline Subftances, 

 which at different Times are faid to have fallen on the Earth ; alfo ®n various 

 Kinds of Native Iron. By Edward Howard, Efq. F. R.S. From the Philo- 

 ibphical Tranfaaions, 1802. - - 153 



V. Experiments and Obfervations on the Heat and Cold produced by the 

 Mechanical Condenfation and Rarefaction of Air. By John Dalton 160 



VI. An Account of a Method of copying Paintings upon Glafs, and of making 

 Profiles by the Agency of Light upon Nitrate of Silver. Invented by T. 

 Wedgwood, Efq. With Obfervations by H. Davy. From the Journals of the 

 Royal Inftitution, I, 173. - - - - 167 



VII. Obfervations and Experiments upon Oxigenized and Hyperoxigenized 

 Muriatic Acid j 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 

 Philoibphical Tranfaaions for 1802. - - - 171 



VIII. Defcription of the Indian Hand Mill. From a Correfpondent. 186 



IX. An Effea hitherto unpublifhed, by which the two Elearicities are diftin- 

 guiflied. In a Letter from Mr. John Cuthbertfon. - - 188 



X. Palpable Mathematics ; or Methods of writing and calculating for the Ufe 

 of the Blind. By J. B. Berard. - - 189 



XI. Obfervations on the real Nature of the Precipitates formed by the Pruf- 

 fiates in Acid Solutions of Barites, and the Affinities of the Pruflic Acid. By 

 Citizen Guyton. ------ 193 



XII. A Review of fome Experiments, which have been fuppofed to difprovc 

 the Materiality of Heat. By William Henry. From the Memoirs of the 

 Literary and Philofophical Society of Manchefter, Vol. V. Part II. 197 



XIII. Enquiries concerning the Dilatation of the Gafes and Vapors. Read 

 to the National Inftitute of France. By Cit. Gay Luffac. - 207 



XIV. Defcription of a new Secret Lock. By J. B. Berard. - 216 

 Scientific News. Cheap Method of producing Light.-- On the Refteaion of ob- 



fcure Heat. — On certain Faas commonly urged againft the Doarine of two 

 Elearic Fluids. .-.- 222, 223 



DECEMBER 



