ii CONTENTS. 



AUGUST, 1804. 



Engravings of the following Objefts : 1. Specimen of a very curious antique 

 CompoTition or Painting, m coloured Glafs, by an Art at prefent loll; 2. An 

 improved Lamp for producing a ilrong Heat in Chemical Expe.iments, by 

 Mr. Accum. 



I. On the Paftes, coloured Glafles, or Enamels, of the Ancients. By M. 

 Klaproth - - , - - 225 



II. On Spontaneous Inflammations. By G, C. Bartholdi, Profeflbr of Phyfic 

 and Chemiftry - - - - 235 



III. On the Solution of Water in the Atmofphere ; and on the Nature of 

 atmofpherical Air. By Mr. John Gough. From the Author 243 



IV. Reply to the Obfer.ations of M, TAbbe Hiuy, on Arfeniated Copper. By 

 M. le Conite de Bournon, Member of the Royal and Linnean Societies of 

 London - - - - - 247 



V. Procefs for feparating Alumine from Alum. In anfwer to the Enquiries of 

 R. T. By Mr. Frederick Accum - - - 260 



VI. Short Account of Mr. A. Woolf 's Improvement in the Conftru<Slion of 

 Steam-Engines - - - - 262 



VII. Defcription of a Chemical Lamp, with double concentric Wicks. Com.. 

 municated by Mr. Frederic Accum - - 266 



VIII. On the mutual Precipitations of Metallic Oxides. By J.L. Guy-Luffac 270 



IX. A Report of the State of his Majefty's Flock of Fine Wooled Spanifh 

 Sheep, for the Year ending Michaelmas, 1803- By the Right Honourable 

 Sir Jofeph Banks, Bart. P. R. S. &c. &c. From the printed Copy com- 

 municated by the Author - - - 277 



X. On the Oxides of Lead. By Thomas Thomfon, M. D. Communicated by 

 the Author - - - - 280 



XI. On certain Chemical EfFefts of Light. In a Letter from Wm. Hyde 

 Wollafton, M. D. F. R. S. - ' - 293 



XII. lUuftrations of Mr. Dalton's Theory of the Conftitution of Mixed Gafes. 

 In a Letter from Mr. Wm. Henry, of Manchefter, to Mr. Dalton. Com- 

 municated by the Writer . , - 297 



XIII. On the Difappearance of Oxigen and Hidrogen over Water, at the Heat 

 of the Atmofphere. By T. S. T. - - - 301 



XIV. Letter from Dr, P. A. Nemmich, expreffing Doubts with regard to the 



Death of the celebrated Humboldt ' = - 303 



