INDEX. 



Pilon's groupe of graces, 130 

 Pinkerton's geography, iao 

 ;Firite of France, analyfis of, ai2 

 Planchc, M. 42 

 Platina, fubftances found with, 117 — 



Precipitation of, 120.^ — Condiidling 



powers of, as to heat, 127. — Rate of 



«xpanfion by heat, 127 

 Playfair, profeflor, communication from 



rcfpefling two interfeding rainbows, 



74. — His iiluftralion of the Huttonian 



theory, 330 

 F-lUa poknkay prize queflion on, 185 

 Plumbago, mines of, 370 

 Poidevin, M. on the danger of ufing 



earthenware of bad quality, 361 

 Political economy, prize queftion in, 186 

 Ponz.'s fyftematical enuii^eration of the 



coleoptera of Saluzzo, 37 1 

 Porcelain of Reaumur, 439 

 Pororoca., a fingular motion of the waters 



of the river Amazons, 152, 154 

 Pofition, the true, of a place, 218 

 Pottery, bad, danger of ufing, 361 

 Prieft, M. de. St. 204 

 Prieftley, Dr. on air, 90. — On elaftic 



fluids, 278, 283 

 Prize queftions propofed by the univerfity 



of Wilna, 184 

 Piouft, Mr. his experiments on tannin, 



36 

 Piufllate of mercury a teft of palladium, 



126 

 Pugilifts, &c. training of, 309 



,QuerIes for difcpveriog the principles of 

 training perfoos /or athle^Jc exercifcs, 



309 

 Quefnay, Dr. cpmparifon of his trafts 



with thofe of Dr. Adam Smith, a prize 



quedion, 1S6 

 <2.ulckfan'Js on downs, how/ormed, and 



how to be avoided, 3 19 



R. 



Rainbows, account of two iniixkOimi, 74 



Ramfdcn's portable circle, 275 



Ranunculus Ficaria^ the plant which 11 

 fuppofed to have"furniflicd the materials 

 of the Ihower of peas in Silefia, 91 



Rafhleigh, Mr. 257 



Rattle fnake fuppofed fafcinating power 

 of, 300 



Rcarmur's porcelain, 439. 



Rcfpiration of gafeous oxide of azcte, 11 



Re>, John, an early writer on combuf- 

 tion, &c. 8i 



Reynard, M. on the foul air of oil cif- 

 terns, 238 



Rhodium, a new metallic fubftance fbund 

 in the ore of platina, 118, 122 



Richardfon,Dr. his account of fome fpe- 

 cimens of bafaltes from the N. coaft of 

 Antrim, 273^ 287 



Richter, Dr. his opinion of the crimfon 

 coloured gold upon porcelain, 367 



Riftant, M. his experiments with muria- 

 tic acid, 138 — Obfervatioas thereon, 

 224 



Rizzetti on pul^nenary consumption, 371 



Robifon, Profeflor, 170 



Rocks, account of the art and inftruments 

 ufed for boring and blafting, 192 



Rondelet and Co. their report on the 

 founding the ftatue of Joan of Arc, in 

 bronze, by a way never before ufed for 

 large work.-, 128 



Roffi's experiments on nitric and oxigen- 

 ated muriatic acid, in the cure of dif- 

 eafes, 370 



Roufleau's caft from Pi4on's groupe of 

 graces, 130 — and from Gois's Joan of 

 Arc, 131 



Rules, parallel, imperfeftion in thofe ge- 

 nerally ufed, and defcription of one ex- 

 empt from lateral deviation, 196 



Rules of living fometimes rafti and dan- 

 gerous, 310 



Rutherfojd, Dr. on the effeft of madder 

 with bones of animals fed with it, 410, 



Saccjiarlnc 



