cxxxri INDEX - 



Planets, general account, p. 8187; Notes 3739. Astrea, Editor's Preface, 

 p. viii. Ceres, p. 82, 84. Earth, 8290. Juno. p. 82, 84. Jupiter, p. 8289, 

 Mars, 8287, 122. Mercury, p. 8286. Pallas, 8285. Saturn, 8289. 

 Venus, p. 8286. (Her independent or phosphorescent light, p. 97, 188.) 

 Vesta, p. 8285. Uranus, 8285, 8690 ; Note 39. Closely connected orbits 

 of the small planets, with the exception of Pallas, p. 116. 



Plato ascribed thermal springs and all volcanic phenomena to the Pyriphlegethon 

 or subterranean fire, p. 227 ; Note 225. 



Playfair, on the Schehallien experiments, Note 136. On the rise of the mainland 

 in Sweden, Note 350. 



Pliny (the elder), his physical description of the world, p. 59. On the smallness 

 of the earth relatively to the universe, p. 155 ; Note 128. On the attraction 

 of amber when rubbed, and of the loadstone, p. 176 ; Note 161. Remarked 

 the peculiar burnt appearance of the crust of aerolites, Note 80. Aware that 

 magnetism can be imparted permanently to iron, Note 149. On the stone of 

 ./Egos Potamos, Note 69. Remarks on earthquakes, Notes 183 and 184. De- 

 scribed flames fed by emissions of inflammable gas, as the Lycian Chimera, 

 p- 210 ; Note 207. Remarks on jasper, Note 274. On the uniudented form of 

 the continent of Africa, Note 344. 



(the younger), volcanic ashes, and description of the great eruption of 



Vesuvius, p. 225. 



Plutarch, truly conjectured aerolites to be celestial bodies, p. 123. Supposed 

 relation between the depth of the sea and the heights of mountains, Note 360. 



Poisson, on the identity of the mass of the planet Jupiter, as determined from its 

 influence on his own satellites, on Encke's cornet, and on the small planets, 

 p. 52 ; Note 23. Surmises the possibility of aerolites igniting far beyond the 

 range of our atmosphere, p. 110 ; Note 63. Hypothesis to explain the occa- 

 sional non-appearance of August and November aerolites, p. 118; Note 78. 

 Hypothesis respecting the temperature of the globe and the degree of warmth 

 observed in mines arid Artesian wells, p. 166, 167 ; Note 137. First suggested 

 the measurement of the magnetic force in parts of an absolute scale, since 

 accomplished and brought into use by Gauss, Note 158 (Editor). 



Polarisation, chromatic, of light, p. 37, 97 ; Notes 16 and 51. (See "chromatic" 

 and light.") 



Polybius and Eratosthenes, on the pyramidal form of the Iberian, Italic, and 

 Hellenic peninsulas, p. 283. 



Pons, comet, p. 102. 



Posidonius, description of the " Lygian field of stones" at the mouih of the 

 Rhone, Note 61. 



Pouillet, ascribes atmospheric electricity to the growth of plants, p. 333 ; Note 410. 



Prevost, ephemeral apparition of the igneous island of Ferdinandea, p. 231 ; 

 Note 233. 



Prichard on the dark-coloured African nations, p. 351, 352 ; Note 436. Divides 

 mankind into seven races, p. 353 ; Note 439. 



Pyramidal form of the southern terminations of great masses of land, p. 30, 282, 

 283 ; Note 344. 



Pyriphlegethon, p. 227 ; Note 225. 



Pythagoras, and Pythagorean philosophy, p. 56, 57 ; Note 27. 



Quarterly Review, article on magnetism, by Sir John Herschel, p. 178; Note I6b. 



Quenstedt, on the lower limit of belemnites, p. 266; Note 312. 



Quetelet, with Olbers and Benzenberg, first made known the periodicity of the 



