INDEX. 451 



have preserved the Colchester sphinx, 14, 16 — remark on the 

 engravings of it, 15-17 



Spinal nerves, on the irritation of, 428-430 



Stars, easy method of computing the aberration of, 151-154 



Statuary Marble quarries, notice of newly discovered, in Tus- 

 cany, 193 



Steain-engines of England, power of, 404 



Steel, alloys of, with chromium andiron, 173, 174 — experiments 

 on various alloys of, 316-318 



Succinic Acid, process for obtaining, 179 



Sul-phurets, analyses of ferro-arsenical sulphuret of copper, 

 30-32 — of an antimonial sulphuret of copper, 32-34 — of acu- 

 preous sulphuret of lead and antimony, 34-36 — of the sul- 

 phuret of bismuth and copper, 36, 37 



Sulphuric Acid, account of a supposed new metal from the resi- 

 duum of, 315, 316 — cause of its high price in England, con- 

 trasted with that manufactured in France, 355, 356 



Sun, observations on the heat produced by the rays of, during 

 the solar eclipse of September 7, 1820, 313, 314 



Superior (Lake) account of the native copper mines of, 422, 423 



Tanning, use of the larch tree in, 406 



Tea, black, analysis of, 201, 202 — and of green tea, 202 — re- 

 marks thereon, 204, 205 — table of soluble matter in, 206 



Temperature of the earth at various depths, 339, 340 



Test, for arsenic, 411 



Time, table for reducing sidereal to mean, 167 



Tin, increased weight of, when calcined, accounted for, 295- 

 227 



Tissxies, how rendered incombustible, 413 



Titanium, analysis of a compact ore of, from Areadal, 265, 266 



Topaz of Saxony, analysis of, 266-268 



Tungsten, on some compounds of, 171, 172 



Ure (Dr.) experiments and observations of, on the atomic 

 weight of silver, and on the constitution of liquid muriatic 

 acid at different densities, 286-291 



Vegetation, effects of copper on, 178 



Verona, analysis of the green earth of, 276, 277 



Volcanic appearances in the moon, notice of, 133 



Volcanoes of mud in i)0g8, probable origin of, 427 



Voltaic electricity , observations on, 183, 184 — contact in, 185 



Water, thickened by fire, 58-60 



Watt (Mr.), contrivance of, for consuming smoke, 34!* 

 Weaving, improvement in tlic salubrity of, 332 

 Whidbcy (Joseph, esq.), account of fossil bones (bund at I'ly- 

 mouth. 124-133 



