CONTENTS. 



XXXiri. Observations on the Snlplutrous Acid. By M. 

 Planche. Read to the Pharmaceutical Society of Paris 174 



XXXIV. On Matting. By Jotm Carr, Esq. .. 177 



XXXV. An improved Method of making Muffles for Che- 

 mical Purposes. By Mr. KoMV^DTuKRELh .. 1S7 



XXXV^r. Description of a Machine for raisimr Coals or 

 other Articles from Mines^ By Mr. GilbepxT Gilpin 192 



XXXVI f. Remarks on an Essay on Commerce, published in 

 the Philosophical Magazine Jar June 1808, Vol. xxxi. 

 Num. 121, p. 8 200 



XXXVIir. Analysis of the lately discovered Mineral If^'ciiers 

 at Cheltenham ; and also of other Medicinal Springs in its 

 Neighbourhood. Ihj Frederick Accum, M.R.I. A. 

 Operative Cheynist, Lecturer on Practical Chemistry and 

 on Mineralogy and Pharmacy, &c 208 



XXXIX. Memoir upon the Desulphuralion of Metals. 

 By M. GuENiVEAU, Engineer of Mines .. .. 213 



XL. Essay upon Machines in General. By M. Carnot, 

 Member of the French Institute, '&c. &c 220 



XLI. On the Planet Festa. 5/y S.Groombridge, Esq. 228 



XLir. Notices respecting New Books 230 



XLTIl. Intelligence and Miscellaneous Articles .. 236 



■ XLIV. Description of the Apparatus invented by W. H. 



Pepys, Esq., for the Decomposition of the Alkalis under 



Naphtha, by Galvanism .. ..241 



XLV. On the Crossing Spider. By R. Teed, Esq. 242 



XLVI. On Oxalic Acid. By Thomas Thomson, M.D. 

 F.R.S. Ed. Communicated by Charles Hatchett, 

 Esq., F.R.S .. .... ..244 



XLVI I. Description of Mr. G. Atkins's Hydrometer for 

 determining the Specif c Gravity of both Solids and Li- 

 .9"2"<^^ • • , 254 



XLVIIL Description of Mr. Christopher Wilson's 

 Secure Boat, or Life Boat 239 



XLIX. Descriplion of a Canstan, which works without re- 

 quiring- the Messenger or Cable coiled round it to be ev"r 

 surged, i^y J. Whitley BoswKLL, ii.y^'. .. 267 



L. On the Nature of the Earths 273 



LI. On Super-acid and Snb-acid Salts. By William 

 ilruE WoLLASvoN, M.D. Sec. R. S 276 



LI I. Oil the Uses of Sugar for fattening Cattle .. 231 



LIIL Essay 



