ANALYTICAL INDEX. 



Periodic stars, ii. 358. 



Permament gases, nature of, ii. 315. 



Phases of the moon, i. 309. 



Philosophy offeree, ii. 208. 



Phosphorescence, ii. 194. 



Physical constitution of comets, i. 513-528; 



of Mars, i. 152. 

 Piuzzi discovers Ceres, i. 206. 

 Pion, ii. 336. 

 Piston, application of the, to steam-engine 



illustrated, ii. 486. 



Pistons, ii. 484; metallic pistons, ii. 485. 

 Piston-rod and beam, connexion of, in dou- 

 ble-acting engine, ii. 453-457. 

 Plan of the working machinery of an engine, 



ii. 547. 



Planes of cleavage, ii. 27. 

 Planetary nebulae, ii. 391. 

 Planets, are they inhabited? i. 52; their 



pnalogy to the earth, i. 53. 

 Planet Herschel, discovery of predicted by 



Clairaut, i. 184. 

 Plug-frame, ii. 415. 

 Plurality of worlds, i. 51-64. 

 Pneumatic trough in the chemical laborato- 

 ries, i. 302. 



Pointed and blunt lightning conductors,?!. 104. 

 Pointers, the, ii. 334. 

 Poison's analytical works, i. 139. 

 Polarity of the magnet, illustrations of, ii. 113. 

 Pole-star, the, ii. 332. 

 Pontecoulant predicts a third appearance of 



Halley's comet, i. 186. 

 Pools, disappearance of, i. 607. 

 Popular fallacies, ii. 85-96. 

 Popular impressions respecting the effects 



of thunder, ii. 78. 



Porosity, ii. 28 ; all bodies have pores, ii. 29. 

 Positive and negative electricity, i. 115. 

 Potash and soda, decomposition of, i. 385. 

 Powder-magazines, lightning conductors for. 



ii. 106. 



Power of a locomotive, ii. 554. 

 Priming and lugging of the tides, i. 216. 

 Princeton steamer, i. 280. 

 Principle of heat, most ordinary sources of, 



ii. 183, 184. 



Principle of the steam-engine, ii. 314. 

 Prism, the, i. 577. 



Prismatic spectrum, the, i. 438, 577. 

 Procyon, ii. 338. 

 Prognostications of the weather by the 



ancients, i. 406. 



Proper motions of the stars, ii. 370. 

 Proportion of the diameter to the stroke of 



the cylinder of steam-engine, ii. 521. 

 Prospects of steam-navigation, i. 269-282. 

 Protection from lightning, ii. 99-108. 

 Pulley, the, ii. 271-280. 

 Pulsations of the eye, i. 230. 



Q. 



Quadrupeds, motion of, ii. 236. 

 QuicKsilver passing through the porus of 

 wood, ii. 28. 



R. 



Rack rail, ii. 531. 



Radiation, i. 333. 



Radiation of heat, i. 437-456. 



Radiation, reflection, and absorption of heat, 

 i. 446. 



Radius-rod, the, ii. 469. 



Railway, Liverpool and Manchester, ii. 

 534. 



Railways, ii. 527. 



Rain, luminous, ii. 81. 



Range of the tides, i. 218, 219. 



Range of vision, ii. 357. 



Ratchet-wheel, ii. 255. 



Rays of heat exist unaccompanied by light, 

 i. 438. 



Rays of light, diverging and converging, ii. 

 348. 



Records of mining, ii. 523. 



Rectangular lever, ii. 250. 



Red moon, the, i. 502. 



Reflection, irregular, i. 260 ; at plane sur- 

 faces, i. 260; its laws, i. 261 ; at curved 

 surface, i. 263. 



Reflection of light, i. 259-266 ; of liquids, i. 

 265. 



Reflectors, concave and convex, i. 263. 



Refraction at plane surfaces, i. 576. 



Refraction of a ray of light, i. 575. 



Regulus, ii. 338. 



Relation of heat and light, ii. 187-194. 



Relative brightness of the stars, ii. 346. 



Resinous electricity discovered by Dufaye, 

 i. 108. 



Resistance produced by friction, ii. 262 ; ex- 

 periments on resistance, ii. 263. 



Rest and motion, i. 361. 



Revolving shafts in spinning machinery, ii. 



259. 



Richmann, death of, i. 126. 

 Rigel, ii. 336. 



Ritter's secondary pile, i. 376. 

 Roads regarded as inclined planes, ii. 284. 

 Rolling thunder caused by echo, i. 554. 

 Rotatory motion of the planets, i. 56. 



S. 



Sabine's observations of luminous clouds, i 



547. 



Safety-valve, the, ii. 511. 

 Salts, crystallization of, ii. 26. 

 Sand fused by artificial heat, ii. 69. 

 Satellites of Saturn, i. 251. 

 Saturn, his diurnal rotation, i. 245; his at 



mosphere and rings, i. 246; when his 



rings will be visible at the earth, i. 249; 



his satellites, i. 251 ; variety of his months, 



i. 251. 



Saussure's electroscope, ii. 150. 

 Savery's engine, ii. 405. 

 Sawmill at Southampton, England, ii. 259. 





