INDEX. 



Mineral, from North America, its compe- 

 tition, 177 

 Moles, their general habits, 74 



N. 



Newton, 79, 168 — His objections to the 

 undulatory fyftem of light, 89. — Prin- 

 cipia, 88. — Theory of the law of un- 

 dulations, 266 



Nicholfon, 304. — On Volta's pile, 303 



Nitrous gas, its effects on fpontaneous 

 light, 103 



Nomenclature, remarks on, 21a 



O. 



Olbers, his difcovery of a new planetary 

 body, 20, 58 



Ore, from North America, defcriptionof, 

 130, 13a 



Oxigenation is not the fame act as combuf- 

 tion, 11 



Oxigen gas, tables to fhew the difference 

 in the quantity and quality of, obtained 

 from plants expofed to folar light in ri- 

 ver water, and water impregnated with 

 carbonic acid, 154, 156 



Pallas, the new planet, remarks on, by 

 Baron de Zach, 213. — Elements of the 

 orbit of, 214. — Ephemeris of the pofi- 

 tion of, 215. — Di mentions and nature 

 of, by Dr. Herfchel, 221 



Paper-making, remarks on by Dr. H. 

 Campbell, 6 



Pearfon on the new planet Ceres, 48.— 



' his analogy for deducing the greateft 

 equation, obfervations on, by Mr. O. 

 Gregory, 65 



Pelletier, 98 



Phlogifton, anfwer to Dr. Prieftley's de- 

 fence of the doctrine of, by Mr. W. 

 Cruickfhank, 42 



Fhofphorefcence, caufe of, in the tremo- 

 lite and dolomie, 292 



Phofphorus, caution againft the ufual me- 

 thod of keeping it, 41. — Experiments 

 on Canton's, 105.— Its acidification in 

 nitrous acid, 209 



Piazzi, Mr. 56 



Pictet, 164, 246, 248 



Pigott, Mr. 182 



Pifton, elaftic, 6 



La Place, 95 



Planet, new, difcovered by Dr. Olbers, 

 20 



Plants, experiments on the vegetation of, 

 by James Woodhoufe, M. D. 150.— 

 Effects produced by their growth in at- 

 mofphericai air, 152. — By their leaves, 

 expofed to folar light in a mixture of 

 atmofpheric and carbonic acid gas, 153. 

 — Objection to the hypothetic of their 

 emiffion of oxigen and abforption of 

 azote, 159.— Tables to fhew the effects 

 of their leaves when expofed to folar 

 light, 160 



Playfair, Profeffor, 229, 23 1 



Pontier, 64 



Pre/Ture engine of Trevithick, 5. —In- 

 vented in 1 73 1, ib. 



Prieftley, Dr. his method of decompofing 

 carbonic acid gas, 46 



Prieftley, Rev. J. his obfervations on the 



m theory of chemiftry, 69, 136, 158. — 1 



On the converfion of iron into fteel, 



*33 



Prony, Mr. 246 



Proof fpirit, its fpecitic gravity, 277 



Prouft, 72, 195, 116. — On tanin, 198, 

 200 



Pump, method of applying a temporary 

 forcer to a, by Mr. Richard Trevi- 

 thick, 216 



Putrefaction, obfervations on the caufes 

 why a large quantity of fait prevents, 

 and a fmall quantity haftens, 239 



Pyrites, account of the, found in the 

 ftone from Benares, 260 



Rags, for paper, valuable obfervations on, 



7 



Read, 



