INDEX. 



Ochroit earth, notice of, 141 — Chemical 



examinadon of, 207 

 Odorant bodies, emanationB of, 201 

 Oil, is a wotfe conductor of heat, than 

 mercury, 139 — Mutual repulfion with 

 alcohol, 203 

 — effential, repulfive aftioa of, 203 

 Optic nerve, efFe£t of the galvanic influ- 



ence on the, 215 

 Orbits of the new planets, 222 

 Orfted, Mr. 176, 184, 212, 214 

 Ofmium, a new melaJ found in piatina, 



221 

 Oxidation, requires a difengagement of 

 electricity, 72 — Of metals in pure wa- 

 ter, produces an acid, 185 — Its influ- 

 ence on metallic precipitations, 274 

 Oxide of cobalt, fupcrior hygrometric pro- 

 perties of, 85 

 Oxides, metallic, on the mutual precipi- 

 tations of, 170 — Neutralization of the 

 acids by, 273 — Great importance of the 

 analyfis of, 280 — Propofed nomencla- 

 ture f^r, 292 

 Oxigen, a compound of water and plus 

 eleftriclty, 71 — On its nature as de- 

 duced from galvanic experiments, 88 — • 

 Difappearance of a mixture of it and 

 hidrogen over water, 301 



P. 



Painting on glafs, method of, praftifed by 



the ancients, 233 

 Paintings, invention to multiply copies 



of, 236 

 Palcani, Dr. 218 

 Paper, fpontaneous inflammation of, in 



nitric acid gas, 98 — Yields fuberic acid, 



142 

 Parry, Dr. 279 

 Partes of the ancients, memoir on the, 



225 — Refemble ou# enamels, 233 

 Paum, 2z6 

 Pearfon, Dr communication from him 



refpecting a diftinguifliing property of 



the galvanic and electric fluids, 9S — 205 



Pendulum for regulating the ftriking part 

 of a clock, 162 



Pennant, Mr. 105 



Perifcopic fpeftacles, examination of the, 

 38 



Perrins, Mr. his table of the temperature 

 of the fea compared with the atmofpheft 

 132 



Pfafft", 177 



Phofphate of magnefia is found in the 

 bones of animals but not in thofc of 

 men, 85 



Phofphoric r-igs accounted for, 64 



Phofphorus in charcoal may caufe detona- 

 tions, 242 



Piciet, 138, 198 



Pile of difhes, recommended for galvanic 

 experiments, 2, 4 



Pipe, ready method of eftimating thecon» 

 tents (if, 64 



Piper, Mr. 20 



Pifo, 107 



Planets, orbits of the new, 22a 



Plant which occafions the dry rot, 5 



Piatina, aftion of eleftricity on. So— Caufe 

 of the difierence of colour in the triple 

 falts of, ii8--Foreign admixtures in,ifa- 

 —Blue fublimate obtained by diftilling, 

 119 — Chemical examination of a me- 

 tallic fubftance peculiar to, 125— Two 

 nevi/ metals difcovered in, 220 



Playfair, Prof, oblervations on his me- 

 moir on the figure of the earth, 12, 156 



Pliny, 225 



Plough, defcriptlon and drawing of a three- 

 furrow, 24 



Potaflj, examin-alion of a ftone containj-n^ 

 126 



P. Qj^ on an ancient Egyptian Lock, 115 



Precipitates, metallic, are not pure ox- 

 ides, 273 



Prevoft, 201 



Prieftiey, Dr. 72, 147 



Problem fjr finding the figure of the earth, 

 folution of, 13— In fphercidal triangles, 

 5' 



Protej;, 



new, i;i 



