INDEX. 



Kicolai on the fpeftres produced by dif- 

 cafe, i6i — Difquifitions on his account, 

 ^^^ 



Nitrate of filver, a good tcft for arlcni- 

 ated hidrogen, zo8 



O, 



Oftant, advantageous method of conftrudl- 



ing, 220 

 Ocular fpeftra, nature and caufes of) 



429 

 Oil, from the arachis hypogee?., or ground 



nut, 224 



of rofes, cryftallization of, 134 



Orchards, obfervations on the ufelefs trees 



in, 124 

 Orfted, a2i 

 Oxide of fulphur, inquiries into the na^ 



turc of, 102 

 " of titanium, reduftion of, 62 



, white, of phofphorus, properties of, 



133 



P. 



Padlock of fecurity, 43 — Method of ap- 

 plying as a defence to the key -hole of a 

 door, 44 



Paramos of South America are piercing 

 cold, and deftitute of vegetation, 242 



Parhelia, theory of, 56 



Payfle on the preparation of a lute for 

 chemical operations, 140 



Pearl-afh, probably hurtful in tanning, 



41 



Pelletier, i, 79, 130 



Pepys, Mr. the inventor of the apparatus 

 for drying precipitates, 287 



Phantoms produced by difeafe, 161 



Phofphate of foda, new^ method of pre- 

 paring, 63 



Fhoighoric acid, cryftallization of, 131 



Phofphorus, experiments and obfervatldfts 

 on its combination with fulphur, 1 — 

 Danger of expofing the compound tm 

 heat, 2 — Phenomena produced by the 

 diftillation of the mixture, 3^^— -Cannot 

 be obtained pure, 133 — Converfion in- 

 to white oxide, ib. ^ 



— ^ > i liquid, produced by diflblv- 



ing phofphuret of fulphur in oil, 5 — ■ 

 Luminous properties of, 6 



Phofphuret of fulphur decompofes water 

 and atmofpheric air, 4 — May be em- 

 ployed as an eudiometer, ib.— ^Decom- 

 pofes nitric acid, 5 — Is foluble in fat 

 oils, ib. — In ether and volatile oils, and 

 fparingly in alcohol, 6 — Accenfion by 

 oxigenized muriatic acid gas, ib. — When 

 inflamed it burns in nitrous gas and ni- 

 trous oxide, 7— Combuftion in a va- 

 cuum, ib.— No change of temperature 

 produced by its formation, ib.— More 

 poifonous than phofphorus, ib. 



Pinel, 140 



Poole, 37 



Preponderance, apparatus for illuftrating 

 the doftrine of, 59 



Prince, Dr. letter from, refpefting his 

 air-pump, 235 



Produfts of chemical analyfis, apparatus, 

 for drying, 212 



Prouft, 36, 132, 201 



PrulTic acid, method of obtaining it pure, 



Pfycological remarks on the fpeftres pro- 

 duced by difeafe, 161 



Purification of phofphorus, impoflibllity 

 of, ^zz 



Purkis, 41 



Pyrometer of platina, 89 



Quadrant, reflefting, improvement on, 



219 

 Quadrupeds, new, 741 



Ramond's 



