INDEX. 



371 



Palseosaurus and Thecodontosaurus of 

 Bristol, 274. 



Muscheiibroek on the frequency of mete- 

 ors in August, 125. 



Myndius, Apollonius, on the Pythagorean 

 doctrine of comers, 103, 104. 



Vature, result of a rational inquiry into, 

 25; emotions excited by her contem- 

 plation, 25; striking scenes, 26; their 

 sources of enjoyment, 26, 27 ; magnifi- 

 cence of the tropical scenery, 33, 34, 35, 

 344 ; religious impulses from a com- 

 munion with nature, 37 ; obstacles to 

 an active spirit of inquiry, 37 ; mischief 

 of inaccurate observations, 38 ; higher 

 enjoyments of her study, 38 ; narrow- 

 minded views of nature, 38 ; lofty im- 

 pressions produced on the minds of la- 

 borious observers, 40 ; nature defined, 

 41 ; her studies inexhaustible, 41 ; gen- 

 eral observations, their great advanta- 

 ges, 42 ; how to be correctly compre- 

 hended, 72 ; her most vivid impressions 

 earthly, 82. 



Nature, philosophy of, 24, 37; physical 

 description of, 66, 67. 73. 



NebulcB, 84-86 ; nebulous Milky Way at 

 right angles with that of the stars, 150- 

 153 ; nebulous spots, conjectures on, 

 83-86 ; nebulous stars and planetary 

 nebulae, 85, 151, 152 ; nebulous vapor, 

 83-86, 87, 152 ; their supposed conden- 

 sation in conformity with the laws of 

 attraction, 84. 



Neilson, gradual depression of the south- 

 ern part of Sweden, 295. 



Nericat, Andrea de, popular belief in Syr- 

 ia on the fall of aerolites, 123. 



Newton, discussed the question on the dif- 

 ference between the attraction of mass- 

 es and molecular attraction, 63 ; New- 

 tonian axiom confirmed by Bessel, 64 ; 

 his edition of the Geography of Vareni- 

 us, 66 ; Principia Mathematica, 67 ; con- 

 sidered the planets to be composed of 

 the same matter with the Earth, 132 ; 

 compression of the Earth, 16.5. 



Nicholl, J. P., note from his account of the 

 planet Neptune, 90, 91. 



Nicholson, observations of lightning 

 clouds, unaccompanied by thunder or 

 indications of storm, 337. 



Nobile, Antonio, experiments of the height 

 of the barometer, and its influence on 

 the level of the sea, 298. 



Noggerath counted 792 annual rings in the 

 trunk of a tree at Bonn, 283. 



Nordmann on the existence of animal- 

 cules in the fluids of the eyes of fishes, 

 345. 



Norman, Robert, iarented the inclinato- 

 riura, 179. 



Observations, scientific, mischief of in- 

 accurate, 38; tendency of unconnect- 

 ed, 40. 



Ocean, general view of, 292-311 ; its ex- 

 tent as compared with the dry land, 288, 

 289 ; its depth. 160, 302 ; tides. 30.5. 306 ; 



decreasing temperature at increased 

 depths, 302 ; uniformity and constancy 

 of temperature in the same spaces, 303; 

 its currents and their various causes, 

 306-309 ; its phosphorescence in the 

 torrid zone, 202 : its action on climate, 

 303, 319-329 ; inifluence on the mental 

 and social condition of the human race, 

 162, 291, 292, 294, 310; richness of its 

 organic life, 309, 310; oceanic micro- 

 scopic forms, 342, 343 ; sentiments ex- 

 cited by its contemplation, 310. 



CErsted, electromagnetic discoveries, 

 188, 191. 



Olbers, comets, 104, 109; aerolites, 114, 

 118 ; on their planetary velocity, 121 ; 

 on the supposed phenomena of ascend- 

 ing shooting stars, 123 ; their periodic re- 

 turn in August, 125; November stream, 

 126; prediction of a brilliantfall of shoot- 

 ing stars in Nov., 1867, 127 ; absence of 

 fossil meteoric stones in secondary and 

 tertiary formations, 131 ; zodiacal light, 

 its vibration through the tails of com- 

 ets, 143 ; on the transparency of celes- 

 tial space, 152. 



Olmsted, Denison, of New Haven, Con- 

 necticut, observations of aerolites, 113, 

 118, 119, 124. 



Oltmanns, Herr, observed continuously 

 with Humboldt, at Berlin, the move- 

 ments of the declination needle, 190, 

 191. 



Ovid, his description of the volcanic Hill 

 of Methone, 240. 



Oviedo describes the weed of the Gulf 

 Stream as Praderias de yerva (sea 

 weed meadows), 308. 



Palieontology, 270-284. 



Pallas, meteoric iron, 131 . 



Palmer, New Haven, Connecticut, on the 

 prodigious swarm of shootirig stars, 

 Nov. 12 and 13, 1833, 124 ; on the non- 

 appearance in certain years of the Au- 

 gust and November fall of aerolites, 

 129. 



Parallaxes of fixed stars, 88, 89 ; of the so- 

 lar system, 145, 146. 



Parian and Carrara marbles, 262, 263. 



Parry, Capt., on Auroras, their connection 

 with magnetic perturbations, 197, 201 ; 

 whether atrended with any sound, 200 ; 

 seen to continue throughout the day, 

 197 ; barometric observation at Port 

 Bowen, 314, 315 ; rarity of electric ex- 

 plosions in northern regions, 337. 



Patricius, St., his accurate conjectures on 

 the hot springs of Carthage, 223, 224. 



Peltier on the actual source of atmos- 

 pheric electricity, 335, 336. 



Pendulum, its scientific uses, 44 ; experi- 

 ments with, 64, 166, 169, 170 ; employed 

 to investigate the curvature of the 

 earth's surl'ace. 165 ; local attraction, its 

 influence on the pendulum, and geog- 

 nostic knowledge deduced from, 44, 45, 

 167, 168 ; experiments of Bessel, 64. 



Pentland, his measurements of the Andisa 

 28 



