INDEX. 



Proteus, Peregtlnus, on the figure of the 

 earth, iz — New problems in fpheroidal 

 triangles, 151 



Prouft, 273— His analyfes of metallic ox- 

 ides, 281 



Pyrophorus, caufe of its fpontaneous in- 

 Aaramatloii, 240 



R. 



Rattle-fnake, on the fafclnatliig faculty af- 

 cribed to the, 58 



Rays, invifible, which aft chemically, 

 214 — May be feparated from the colour- 

 ed, 216 



R. B. on early inventions, 35 — On phof- 

 phoric rings, 64 



Red-lead, analyfis of, 289 



Red precipitate obtained from platina, 120 



Remontoire, various opinions refpefting 

 *' the, 47 



Repulfion, mutual, of fluids, 202 



Refpiration, on the change efFefted in the 

 air by, 40 



Richter, 71 



Rings, phofphoric, accounted for, 64 



Rittenhoufe, Mr. no 



Ritter, Mr. his experiments with the elec- 

 tric pile, 176 — His experiments on mag- 

 netlfm, 184, 212— 'His experiments on 

 light, 214, 293 



Roads, machine for clearing them from 

 mud, 29 



R. T. on the difficulty of obtaining alu- 

 mine in a ftate of purity, 141 



Rumford, Count, obfervations on his doc- 

 trine refpefting fluids as non-conduftors 

 of heat, 134, 169, 198 



S. 



Sale of his Majefty's fpare flieep, 280 



Salt, common, utilky of adding it to hay, 

 237 



• of lead, Prouft's, 286 



Salts, triple, of platina, caufe of the dif- 

 ferent colours of, 118 



Scspement, detached, defcription of a, 50 



Scheele, 90, 207, iJa 



Science, on its ftate among the earHer fl»> 



tions of antiquity, 27 

 Scientific news, 62, 142, 22a 

 Sea, table of its temperature compared 



with the atmofpherc, 131 

 Seguin, 42 

 Serpents, on the fafcinating faculty afcrlb- 



ed to, 58 

 Serviere, Monf. Grollier dc, 35 

 Seymour, Lord Hugh, 66 

 Shark, temperature of the ftomach of one 



when taken, 132 

 Sheep, wafliijjg them recommended, 96 



— Report of the ftate of his Majefty's 



flock of fine wooled Spanifh, 177— 



Improvement in the carcafe of the Me- 

 rino, 278 

 Signs, telegraphic, by the human figure, 



165 

 Silver is made brittle by galvanlfm, 85 

 Sines and tangents, table of, 62 

 Sloane, Sir H. 60 

 Snow, on its formation, 73 

 Soap-fuds the beft menftruum for clean- 



fing wool, 95 

 Solar fpeftrum, is feparable into two ferics 



of rays, the one coloured, the otherche- 



mical, 216 

 Somerville, Lord, 278 

 Species, mineralogical, can only be fepara- 

 ted by the exterior charafters, 25a 

 Speftacles, examination of the perifcopic, 



38 

 Spheroidal triangles, new problems in, 151 

 Squares, very extenfivt table of, 62 — ^Eafy 



method of completing them, 150 

 Steam, powerful efFeft of its expanfion,26x 

 Steam-engines, attempt to reduce the con- 



fumption of f uel in, 169 — Improvement 



in the conftruftion of, 162 

 Stone, containing potafti, examination of 



a, 127 — Fadt refpefting water heated m 



a boiler of, 169 

 Sublimate, blue, of platina, chemical cx-^ 



amination of, izo 



Sulphuret 



