CONTENTS. 



Painters' Colours. By Mr. James Rawlinson, f// 

 Derby 176 



XXX. Improved Mill for grinding Indigo, or other dry 

 Colours 180 



XXXT. Aneiu and most accurate Method of Bankijig the 

 Balance of a Time-keeper. By Mr. W. Hardy, of 

 Islington 181 



XXXII. Proceedings of Learned and Economical Sociitii'S 



183 



XXXIII. IntelUgence and Miscellaneovs Articles .... 183 



XXXIV. An Account of the Aeriai Foyage undertaken at 

 Petershurgh on the 3G th of January 1 804. Bead before the 

 Academy of Sciences hy the Academician Sacharof 193 



XXXV^. A brief Account of the Mineral Productions of 

 Shropshire. By Joseph Plymley, A.M. Archdeacon 

 of Salop, and Honorary Member (f the Board of ylgricul- 

 ture 201 



XXXVI. On Metallic Sulphurets. By Professor Proust 



208 



XXXVII. An Analysis of the magnefical Pyrites; with 

 Remarks on some of the other Sulphurets of Iron. By 

 Charles Hatchett, Esq. F. R. S 213 



XXXVMI. Account of an Aerostatic Voyage performed by 

 M. Guy-Lussac, on the 20th of Fructidor, Year 12; 

 and read in the National Institute, I'cndemiaire Qth, 

 Year 13 2'20 



XXXIX. On disclosing the Process of Manufactories . . 223 



XL. An Essay cm. AJedical Entomology. By F. Chau- 

 METON, Physician to the yirmy 230 



XLI. On the Use made of Zinc in Chinct in regard to Coin. 

 By B. G. Sagk 242 



XLI I. On the Use of the Amianthus in China. By B. G. 

 Sage 243 



XLIII. On the Property ascribed to Quicklime of increasing 

 the Force of Gunpowder. By M. Lemaist re, Inspector- 

 General of Gunpoivder and Saltpetre 245 



XLIV. Description of an improved Dra:.:back Lock for 

 House Doors, invented by Mr. William Bullock, of 

 Portland-street , 248 



XLV. Description of a. Screw Press with an expanding 

 Poller. Bij Mr. William Bowler, of Fhislury- 

 Street ." 21 c) 



XLVI. Geographical and Topographical Improvements pro- 

 posed by John Churchman, Esq. Member of the Im- 

 perial Academy of Sciences at St. Petersburgh 251 



XL\'H. Description of a Safety I'alve, containing a Facuum 



I aire in the same Hole (f the Ihiler .• 254 



XLV I II. An 



