516 



INDEX. 



Jupiter's satellites, effect of Jupiter's 

 form on, 31. 



, secular variations of, 32 at seq* 



, periodic variations of, 33. 



, effects of the displacement of Ju- 

 piter's equator and orbit on, 33. j 

 Note 90. 



, rotation of, 77. 



, libration of, 78. 



K. 



Kater, Capt., determines the length cf 

 the seconds pendulum at London, 

 100. 



Kempelen and Kratzenstein, their 

 speaking-machine, 169. 



Kepler discovers the form of the plane- 

 tary orbits, 6. Note 26. His laws, 

 ib. 



Kreil, M., on periodic disturbances of j 

 the dipping needle, 343. 



Kupffer, M., his observations on the ' 

 isothermal lines and the poles of j 

 maximum cold, 298. 



L. 



Lagrange, M., proves the stability of the 

 Solar System, 27. 



Lalande, M., his computation of the 

 contemporaneous conjunctions of the 

 planets, 47. 



Laminse, vibrations of, 163. Notes 181, 

 182. 



Lamouroux, M., on the distribution of 

 sea-weeds, 305. 



Languages, collation of, 309. 



, vocal articulation of, imitated by 



machines, 169. 



La Place, the Marquis, his determina- 

 tion of the invariable plane, 27; and 

 of the great inequality of Jupiter and 

 Saturn, 29. Proves that the lunar 

 perigee and nodes are not affected by 

 the resistance of ether, 42. He dis- 

 covers the cause of the lunar acce- 

 leration, ib. His theory of spheroids, 

 30. He ascribes the motions of the 

 planets to a common Original cause, 



75. Proposes the year 1250 as a uni- 

 versal epoch, 97. Quotation from, 

 98. Proves the Indian tables to be 

 as recent as Ptolemy, 99. Proves 

 that the discrepancy between New- 

 ton's theory of the tides, and observ- 

 ation, depends upon the depth of the 

 sea, 103. On the utility of investi- 

 gations of cause and effect, 107. On 

 capillary attraction, 128. On the os- 

 cillations of the atmosphere, 134. 

 On the comet of 1770, 386. On Hal- 

 ley's comet, 390. On the extent of 

 solar attraction, 393. On the comet 

 of 1682, 408. 



Latent heat, 260. 



Latitude, terrestrial, 5. Note 11. 



, celestial, 11. Note 54. 



, square of the sine of the, 54. 



Note 126. 



Le Verrier, M., zones of instability in 

 the planetary system discovered by, 

 24, 25. His researches concerning the 

 discovery of Neptune, 71. 



Length of a wave, 110. 



of the seasons variable, 84. 



of the day invariable, 80. 



of the civil year, 95. 



of the Egyptian year, 96. 



of a degree of the meridian, 54. 



of the pendulum at London, 100. 



of the tails of comets, 406. 



Lens, 184. 



Leslie, Sir John, his theory of the in- 

 ternal structure of the globe, 88. On 

 radiant heat, 240. 



Level of the sea, length of the pendu- 

 lum at, 100. Note 150. 



Lexel, M., his comet, 389. 



Libration of the moon, 78. 



of Jupiter's satellites, 78. 



Light, 171. 



, velocity of, 36. 



, reflection and refraction of, 171 , 



198. Notes 184, 198. 



, analysis of, 178. Note 190. 



, absorption of, 180. 



, intensity of, 191. 



, dispersion and deviation of, 183, 



222. 



, propagation of, 190, 197- 



, interference of, 187, 217. 



