718 



INDEX. 



Nitre, I. 634. 

 Nitrogen gas, II. 509. 

 Nocetus, II. 489. 

 Noctuary, II. 192. 

 Nodes, I. 504, PI. .34, II. 



340, 372. 

 Nodes of chords, II. 268. 

 Nodes of the planets, I. PI. 



32. 

 Nollet,I.750,r56,II. 126, 



189, 414, 520. B. 1700' 



D. 1770. 

 Nonconductors, I. 666. 

 Nooth, II. 432. 

 Norfolk, II. 495. 

 Noria, I. 327, PI. 22. 

 Norinibergeiise comnier- 



ciuin, n. 108. 

 Norraan, II. 486. 

 Norske selskab, II. 109. 

 North, I. 500. 

 Northern crown, I, 497. 

 Northern hemisphere 



warmer, I. 702. 

 Northern lights, II. 488. 

 Northern passage, II. 366. 

 North pole, I. 687. 

 Norway, II. 498. Society 



of Norway, 109. 

 Norwood, I. 600, 11.362, 



370, 376. 

 Notation of music, II. 273. 

 Notes of music, I. 396, II. 



280". 

 Nourishment of plants, II. 



513. 

 Nouvelliste, II. 435. 

 Noya Caraffa. Duo de Ui 



Noya Caraffa, II. 435. 

 Nucleus of a coinet, I. 



512. 

 Numa, I. 743. 

 Number, II. 1, 113. 

 Numbering vibrations, II. 



272. 

 Number of the stars, I. 490, 



II. 326. 



Numerical equations, II. 8. 

 Numerorum quadratorum 



tabula, II. 115. 

 Nunnez, II. 370. 

 Nuova raccolta, II. 222. 

 Nut, I. 72, PI. 5. 

 Nutation, I. 506. 

 Nutation of the earth's 



axis, I. 509,11. 334. 

 Nutation of the moon's 



orbit, II. 341. 

 Nutrition ^of animals, I. 



738. 

 Nutrition of insects, II. 



518. 

 Oak, II. 168, 169, 509. 

 Oaks, II. 240. 

 Oars, II. 236, 242. 

 Oats, n. 151. 

 Obbiezzioni alia teoria di 



Newton, II. 296. 

 Obelise, II. 348. 

 Object glasses, II. 80, 284, 



286, 288. 

 Oblique collision, II. 136. 

 Oblique cylinder, II. 123. 

 Oblique float boards, I. 



322. 

 Oblique forces, I. PI. 3. 

 Obliqae impulse, II. 226. 

 Oblique vjnpulse of fluids, 



303 

 Oblique reflection, I. 437, 



II. 294. 

 Oblique refraction, II. 605. 

 Oblique threads, II. 41. 

 Obliquity of the crystalline, 



II. 315. 

 Obliquity of the ecliptic, I. 



518, 593, II. 334. 

 Obolus, II. 1C2. 

 Obscure heat, II. 40e. 

 Obscure light, II. 322, 



407. 

 Observations, II. 346, 371. 

 Observations dans les Py- 



lAces, II. 367. 



Observations for finding 

 the situations of places, 

 n. 364. 



Observations made in 

 Cook's voyage, II. 371. 



Observations .of tempera- 

 ture, II. 452. 



Obserrations of the earth's 

 motion, II. 358. 



Observations of the places 

 of the planets, II. 357. 



Observations of the second- 

 ary planets, II. 357. 



Observations of the stars, 

 II. 355. 



Observations of the sun, II. 

 355. 



Observations of tides, II. 

 368. 



Observations of time, II. 

 348. 



Observations sur les ombres 

 colorees,II.314. 



Observations sur la phy- 

 sique, II. 110. 



Observatories, II. 347. 



Observatory, I. 148. 



Observatory for meteorolo- 

 gy, II. 448. 



Observatory of Green- 

 wich, I. 601. 



Observing distances, II. 

 156. 



Occultations, II. 3J0, 345. 



Octave, I. S93. 



Octant, I. PI. 35. 



Octants, II. 350. 



Ocular music, II. 320. 



Ocular spectra, I. 455, PI. 

 30, II. 314. 



Odorous bodies, II. 397. 



Odorous emanations, II. 

 397. 



Odours, II. 423. 



Oencmeter, II. 231. 



Oil, II. 291, 458. ££fect of 

 oil on waves, II. 328. 



Oil candle, II. 245. 



Oil colours, II. 143. 



Oil mill, I. 222. 



Oil mills, II. 214. 



Oil paint, 11. 180. 



Oil paintings, I. 96. 



Oil press, II. 204. 



Oils, II. 322. 



Oil spreading on water, I. 



625, II. 659. 

 Oil swimming on water, II. 



220, 223, 381, 382. 

 Oily substances, I. 213. 

 01bers,I. 508, 603,11. 312. 



334, 586, 591, 597, 673, 



675, 676. Corrections. 

 Old manuscripts, II. 159. 

 Olive oil, II. 509. 

 Oliver, II. 337. 

 Oncia, II. 154. 

 Opera glass, II. 78. ' 



Ophion,II. 333. 

 Opposition, I. 527. 

 Opposition offerees, I.Pl. 5. 

 Optical centre, I. 418. 

 Optical compass, II. 350. 

 Optical fallacy, II. 646. 

 Optical instruments, 1. 420, 



11.76, 281. 

 Optical pencil, II. 287. 

 Optical scenery, II. 284. 

 Optic nerve, 1. 448, 450, II. 



82. 

 Optics, I. 259, 408, II. 280, 



323. 

 Optometer, I. 452, II. 575, 



604, 605, 671. 

 Opuscoli scelti, II. 110. 

 Oran outang, II. 279. 

 Orbit of the sun, J. 500. 

 Orbits of chords, II. 554, 

 Orbits of come t», I. 521, II, 



341. 

 Orbits of the planets, II. 



332, 372. 

 Orbits of the primary 



planets, II. 339. 



