INDEX. 



Nature, wiie provision of, v, 31 



:l\u, description of the, v, 365 

 N*val architecture, Instorv of, v 

 Nebula; observations on various, i, 



63, 108 

 Needle, on the variation of the, iv, 337 ; 



observation* on the magnetic, 387 

 Needles e\c, Derbyshire, ii 

 Neyro, ajiecdote of a, ii, 3os 

 Nephile, inoiiut, described, ii, 4"7 



if, description of the grotto of, 



iii, 70 



Neptunian theory of the earth, i, 236 

 Ness, a river in Flanders, iii, 296 

 Nenfchatel, earthquake at, ii, 43 ; lake 



of, iii, 236 



Nero, course of the river, iii, 22 

 Newcastle, description of, ii, 338 

 New Forge in Iceland, storm at, iv,314 

 New Grenada, volcanoes at, i, 4s~> 

 New Hebrides, volcanoes at i, 466 

 New river, account of the, iii, 37 

 New York, earthquake at, ii, 45 

 Neu-tnii, Sir Isaac, account of, i, 169, 



philosophy of, 921 



Niagara, the falls of described, iii, Jl"> 

 Nieper, account of the, iii, -21 

 Niger, source of the river, iii, 1 8 

 Nightingale, description of the, v, 633 

 Nightshade, varieties of the, v, 250 ; 



remarkable effects of, 2.1 

 Nile, source of the, iii, 13 ; description 



of, 15 ; inundations of the, 16; cata- 

 racts of the, 213 

 A/;// plant described, v, 294 

 Nitric acid, solutions in, iii, 197 

 Nitrous gas, experiments on, iv, 8 

 Noah, history of, i, 246 ; vi, 513 

 Nodes, definition of, i, 208 

 Norfolk, antiquities in, ii, 24 ; fiery 



whirlwind in, iv, 254 

 Northamptonshire, earthquake in, ii, 22; 



sea-shells found in, 15O; storms in, 



iv, 252; effects of lightning in, 317 

 Northern hemisphere, congelation in, 



iv,37 

 North polar regions, rold of the, iv, 100, 



106, 1 1 1 



Nitrtfi river in America, deacribed,iii, 42 

 Nortk west passage, conjecture on, iii, 



SOS 

 Northwich in Cheshire, salt works at, 



ii, 372 



Norway, silver mines in, ii, 284 ; spring* 



in, iii, 222 



\iin( Xcmhia, description of, iii, 303 

 .\nti/alls, experiment with, iii, 1'Mi 

 Nutmeg tret; account of the, v, I J? 

 Nut, account of the votnic, \, 

 Oaks, .submarine, ii, !'<!; petrified, 



146 ; horns found in one, ., ,)l :> 

 O/ilitjnt: sphere described, i, .'>!<> 

 Ocean, varieties of the, i, 3 1<> ; div . 



of the, iii, 289 ; advances and 



MOJIS of the, ii'JI ; temperature 



iv, 33 



Ochreout earths, remark on, i, 

 Oh in, fossil bones at (lie, ii, l.Vj, IS; 



description of tiie, iii, -ID 

 Oil, its effects on the waves, iii, .359 ; 



of thecajeput tree, v, yn<) 

 O lif 11 hole, Somersetshire, described, 



ii, 90 



Olive tree, account of the, v, 67 

 Olives, how preserved, ib. 68 

 Olympus, description of mount, ii, 406; 



of the Myssians, 423 

 Omiiie, a remarkable mountain in Ja- 

 pan, ii, 427 



Onri/ii lake, described, iii, - 

 Ontario, account of the lake of, iii, 248 



ial, mines of, ii, 287 

 Opium plant described, v, 215 

 Opoculpasnm, on the gum, v, 166 

 Oporto, earthquake at, ii, ~>7 

 Optical appearances, singular, iv, 509 

 Orantj Outanu', description of, v, G47 

 Ortynn river in America, iii, 39 

 Orellana, enterprise of, iii, I > 

 Orbits of the planets, on the, i, 207 

 Ores, met. us of, on detecting, ii, 

 Optics, Newton on, i, 174 

 Orickalcum, of the ancients, vi, 27tt 

 Oriuii, on the constellation, i. 7 I, !!> 

 Orizaba in Mexico, volcano of, i. 

 Orleans, account of the isle of, iii, 41 

 Orbit, diameter of the earth's, i, 180 

 Or Mouln, on gilding in, vi, 315 

 Oi-onouko, description of the, iii, 44 

 Orthoceratites, a putrefaction, ii, |.>1 

 Oscillation, of the pendulum, on the, 



i, 154 



Osta mount, described, ii, 407. 

 fMrit-h, natural history of the, v, 609 



method of hunting the, 61 1 , 



American, 015 



