ANALYTICAL INDEX. 



Lateral shock discovered by Dr.Wilson, i. 1 12. 



Latitude, parallel of, i. 562. 



Latitudes and longitudes, the, i. 561-572; 

 how determined, i. 564. 



Lavoisier and Laplace's theory of combus- 

 tion, i. 138; ii. 32(5. 



Leather-suckw, effects of, i. 299. 



Lepaute, Madame, i. 183. 



Leslie's differential thermometer, i. 444; his 

 method of artificial freezing, ii. 171. 



Level of water in a steam-boiler, how indi- 

 cated, ii. 502. 



Lever and wheelwork, the, ii. 243-268. 



Lever, three kinds of the, ii. 247 ; rectangu- 

 lar, ii. 250. 



Levers, combination of, ii. 252. 



Lexell's comet, causes of its appearance and 

 disappearance, i. 427. 



Leyden vial, invention of tho, i. 110. 



Light, i. 223-234 ; velocity of, i. 225 ; waves 

 of measured by Newton, i. 228 ; a pencil 

 of, i. 259 ; light of the sun three hundred 

 thousand times greater than that of the 

 moon, i. 63; light of comets, i. 515. 



Light and heat, uniform supply of, i. 53; 

 relations of, i. 234. 



Light and sound, alliance between, i. 230. 



Li .'iiliiina:, the effects of, ii. 63-82; protec- 

 tion from, ii. 99-108; forked, zigzag, 

 sheet, and ball, i. 538; rising from the 



N earth like a rocket, ii. 78, 79 ; from the 

 ashes, sm6ke, and vapor of volcanoes, i. 

 535. 



Lightning conductors, i. 125; ii. 75; point- 

 ed and blunt, ii. 104; for powder mag- 

 azines, ii. 106. 



Lih;nin? and electricity, identity of, i. 118, 

 122, 549. 



Limbs of animals considered as levers, ii. 

 248. 



Limited height of the atmosphere, i. 198. 



Line or lines of least resistance, ii. 108. 



Liquids not absolutely incompressible, ii. 32 ; 

 non-conductors, ii. 183. 



Living body a conductor of electricity, ii. 

 101. 



Locomotive engine, the, ii. 528; experimental 

 trial of on the Liverpool and Manchester 

 railway, ii. 535; progressive improve- 

 ment of, ii. 537 ; description of the ten- 

 der, ii. 543 ; power of the locomotive, ii. 

 554. 



Load between two bearers, ii. 251. 



Local and periodical changes of the mag- 

 netic variation, ii. 115. 



London water and air panic, i. 160. 



Longitude, how determined, i. 567. 



,ig-glass, effects of the, analyzed, i. 

 264. 



Leper's propeller, i. 278. 



Loss of steam-power, sources of, ii. 51S. 



Lottin's observations of the aurora at Bosse- 

 kop, on the coast of West Finuiark, in 

 1838-'39, i. 91. 



Lower stratum of air, character of, ii. 156. 



Luminiferous ether, i. 22 1. 



Luminous coating of the sun, its thickness 



measured by Herschel, i. 75. 

 Luminous rain, ii. 81. 

 Luminous sleet, ii. 82. 

 Luminous spots on the dark hemisphere of 



the moon, i. 83. 



Lunar attraction, theory of, i. 410. 

 Lunar crater, i. 321. 

 Lunar influences, i. 501510. 

 Lunar mountains, heights of, i. 319. 

 Lunar surface, physical condition of, i. 316 



M. 



Machines, mechanic powers of, ii. 245. 



Madler's observations and telescopic views 

 of Mars, i. 153; his telescopic view of 

 Jupiter, i. 241. 



Magdeburgh hemispheres, the, ii. 54. 



Magnetic attraction, ii. Ill; known to the 

 ancients, ii. 112; laws of discovered by 

 Coulomb, ii. 114. 



Magnetic effects of lightning (vide electro- 

 magnetism), ii. 122. 



Magnetic equator, ii. 116. 



Magnetic meridian, ii. 111. 



Magnetic needle, dip of the, ii. 113. 



Magnetic polarity, ii. Ill, 112. 



Magnetic poles, northern and southern, ii. 

 116. 



Magnets, artificial, method of making, ii. 114. 



Magnetism, ii. 111-116; influence of heat 

 upon. ii. 115. 



Magnetism, electro, ii. 119-128. 



Magnetizing power of the electric current at 

 different distances, ii. 126. 



Magnitude, ii. 20; magnitude of the sun, i. 

 69; change in the sun's magnitude im- 

 possible, i. 481 ; magnitude of the earth, 

 i. 479; of the stars, i. 592. 



Major planets, the, i. 237-256. 



Malus's discoveries in the philosophy of 

 light, i. 233. 



Mars, his distance from the earth, diurnal 

 xotation, &c., i. 15 J ; his atmosphere and 

 physical constitution, i. 152; has he a sat- 

 ellite? i. 153; appearance of the sun at 

 Mars, i. 155. 



Masses of metal melted by lightning, ii. 66. 



Maskelvne's experiments on the weishts of 

 bodies, i. 487, 488. 



Matter and its physical properties, ii. 10- 

 38 ; matter incapable of spontaneous 

 change, ii. 33. 



Measurement of heights, i. 296, 297. 



Mechanical effects of lightning, ii. 69 ; of 

 steam, ii. 436, 437 ; mechanical force of 

 steam, ii. 419. 



Meltin? and boiling points, i. 329. 



Mercurial thermometer, ii. 132. 



Mercury, its diameter, bulk, &c., i. 143. 



Mercury and Venus, their diurnal motion, 

 seasons, climate, and zones, ii. 145, 146; 

 their orbits and transits, geographical sur- 

 face, &c., 147-150. 



Meridian of a place, i. 562. 



