INDEX. 



379 



Needle fwimmlng ontvater. Caufe 

 of, 199 



Nari, On double refraftlon, 306 

 Native iron. Count Bournon oa 

 the origin of, 49 : of Siberia, 

 50 ; of Bohemia, South Ame- 

 rica, and Senegal, 51, 53, 54 

 Nd'vigatwn. Remarks on, 328 

 Nitric ether. To prepare, 369 

 Olhers' planet, iS^ 



Opium. On preparing, 66 



Optical inftrumaiti. Propofed im- 

 provement of, 306 



tonian theory of the earth, re- 

 plied to by Mr. Kirvvan, 5 

 Plomhiers, IFMers 0/", analyfed, 369 

 Poppy. Extraft of, 65 



Porcelain. Painting on, 17 



Pownall (Governor) on the 

 mammoth, 332 



Powder thills. On explofions 

 at, 1 78 



Precepts and recipes for artifts, 

 &c. 117 



Prize quejiinns, 84, 86, 283, 363 

 Pruffiates of barytes aiidlinie, Z']Z 



OreofUninium. Anz\y(\s of, 2'jb PruJJiate of copper. Mr. Hatchett 



Organs, and their faculties, judged 

 of by their form, 80 



Oxygen and hylrogen ^as. On 

 heat excited by, 23S, 298 



■Oxygenated muriate of mercury, 

 preferves animal matters, 372 



Painting. On porcelain and glafs, 



'7 



— — Mr. Dayes on, 31, 97, 



218 

 Parmenlieroa vegetable extrads, 



63 

 Pfa/f on the Mammoth, 162,228 

 Peri'lo'e. Remarks on, 5* 



Perfeverance . Organ of, J 38 

 Pharmacy. On vegetable prepa- 

 rations in, 63 

 Phillipi on fchieferfpath and car- 

 bonate of lime, 489 

 Phofphuret of lime. To prepare, 



Phyftcs. Prize qucftions in, 85, 

 86, 283 

 Pbyftoemomy, Remarks on, 77 

 P/V/W on mt-teors, 272 



Pigment. A new, 359 



Plaifer for \tTTdccfi, 1 25 



Hants. T) prepnre the juices of 



in phaimacy, 6j : fubjctlcd to 



Galvauifm, 90 



Plants abforb moifture from ihe 



air, 205 



Ptaiina. Fufion of, 304 



Pi'iyfair'i reflcdtioiison Mr.Kir- 



wau's rcfuiation of tin Hut- 



on, 359 



Purples for porcelain and glals, 

 18 

 Rain. Confiderations on Dr. Hut- 

 ton's theory of, 55 

 Recipes for artifts, &c. 1 17 

 Reds for porcelain and glaf$ 

 painting, from gold, 1 8 : from 

 iron, 19 

 Refining of lead, 210 ; of filver, 

 216 

 RefraSion, tei reftrial. A curious, 

 176 

 Kre glue. To make, 120 

 Robs. To piepare, 66 

 Roberts and Charles's balloon, 339 

 Rozier's balloon, 33S ; his fate, 



339 



Rod cryfial. Double refraction 



of, applied to optical purpofes, 



306 

 Rofe colours for- glafs and porce- 

 lain, 19 

 Rouge. A new poliniing, 276 

 Rojal Academy ofSiitncs, Berlin, 

 84, 284 

 Ryal Society of Gotti"gen,()i, 363 

 Royal Society of Lo>,d,n i 73. » /", 



360 

 Roy. il Society of Edvihnr^ h 3 63 

 5«^r(7a. Extradl of, 66 



Sal ammoniae. Hints refptftinp, 



J7«S 



Salt. Anew triple, 2- J : ano- 



tlitr|n>.w, 379 



Salt if bitumen. Oi, 2o6 



ialtt 



