L 13 I 



Olbers, comets, 89, 94; aerolites, 100, , 

 105; on their planetary velocity, I 

 108, 109; on the supposed phenom- 

 ena of ascending shooting stars, 111; 

 their periodic return in August, ; 

 113; November stream, 114; pre- 

 diction of a brilliant fall of shooting 

 stars in Nov. 1867, 115; absence of 

 fos.xil meteoric stones in secondary ' 

 and tertiary formations, 119; zo- I 

 diacal light, its vibration through the 

 tails of comets, 132; on the trans- > 

 paremy of celestial space, 142, 143. 



Olmsted, Denison, of Newhaven, Con- 

 necticut, observations of aerolites, I 

 99, 105, 107, 112. 



Oltmanns, Heir, observed continuously 

 with Humboldt, at Berlin, the move- i 

 ments of the declination needle, 184, 



Ovid, his description of the volcanic 

 Hill of Methone, 239. 



Oviedo, describes the weed of the Gulf 

 Stream, as Praderias de yerva (.sea- 

 weed meadows), 313. 



Palaeontology, 272287. 



Pallas, meteoric iron, 120. 



Palmer, Newhaven, Connecticut, on 

 the prodigious swarm of shooting 

 stars. Nov. 12 and 13, 1833, 112; 

 on the non-appearance in certain 

 years of the August and November 

 fail of aerolites, 117. 



Parallaxes of fixed stars, 72, 73; of 

 the solar system, 135, 136. 



Parian and Carrara marbles, 263, 

 264. 



Parry, Capt., on auroras, their connec- 

 tion with magnetic perturbations, 

 191, 196; whether attended with 

 any sound, 195; seen to continue 

 throughout the day, 191 ; barometric 

 observation at Port Bowen, 320; 

 rarity of electric explosions in nor- 

 thern regions, 345. 



Patricius, St., his accurate conjectures 

 on the hot springs of Cartilage, 220, j 

 221. 



Peltier, on the actual source of atmos- 

 pheric electricity, 343, 344. 



IVncati, Count Mazari, partial inflec- 

 tion of calcareous be*v by the con- 

 tact cf syenitic granita in the Tyrol, { 

 263. 

 Pendulum, its scientific uses, 24,' ex- ! 



VOL. J. 2 o 



periments with, 46, 158, 162; en. 

 ployed to investigate the curvature 

 of the earth's surfcce, 156, 167; local 

 attraction, its influence on the pen- 

 dulum, and geognostic knowledge 

 deduced from'24, 25, 159, 160; ex- 

 periments of Bessel, 46. 



Pentland, his measurements of tne 

 Andes, 7. 



Percy, Dr., on minerals artificially 

 produced. See note by Translator, 

 270. 



Permian system of Murchison, 280 



Perouse, La, expedition of, 180. 



Persia, great comet seen in, (1668), 

 128, 129. 



Pertz, on the large aerolite that fell in 

 the bed of the river Narni, 103. 



Peters, Dr., velocity of stones projected 

 from ^Etna. 109. 



Phillips on the temperature of a coaJ 

 mine at increasing depths, 1 66. 



Philolaiis, his astronomical studies, 47? 

 his fragmentary writings, 51, 52. 



Philosophy of nature, first germ, 16. 



Phosphorescence of the Sea, in the 

 torrid zones, 197 



Physics, their limits, 30 ; influence of 

 physical science on ihe wealth and 

 prosperity of nations, 33, 34 ; pro- 

 vince of physical science, 40; dis- 

 tinction between the physical his- 

 tory, and physical description of the 

 world, 64; physical science, cha- 

 racteristics of its modern progress, 



Pindar, 226. 



Plaua, geodesic experiments in Loin- 

 bardy, 159,160 



Planets, 73 84; present number di- 

 covered, 74. (See note by Trans- 

 lator, on the most recent discoveries, 

 74 76 ;) Sir Isaac Newton on their 

 composition, 120; limited physical 

 knowledge of, 147,148: Ceres," 46- 

 76; Earth, 7284; Juno, 46, 76 

 82, 92; Jupiter, 46, 70, 7682, 197. 

 Mars, 70, 7578, 121 ; Mercury, 

 70, 7678; Pallas, 46, 76; Saturn. 

 70, 7678: Venus, 7578, 197; 

 Uranus, 74, 76 78; planets which 

 have the largest number of moons. 

 80. 



Plants, geographical distribution of 

 365360. 



