433 



ii. 1 20 ; artificial, new photometer 

 to determine the relative intensities 

 of, ii. 231 ; of the sun, method of 

 comparing with that of the fixed 

 stars, ii. 355 ; on the reflexion and 

 decomposition of, at the separating 

 surfaces of media of the same and 

 of different refractive powers, ii. 366; 

 on the law of its partial polarization 

 by reflexion, ii. 387; on the struc- 

 ture producing its double refraction, 

 ii. 389 ; on the laws of its polariza- 

 tion by refraction, ii. 394; on the 

 action of the second surfaces of trans- 

 parent plates upon, ii. 395 ; on the 

 phenomena and laws of its elliptic 

 polarization, ii. 407 ; on the depola- 

 rization of by various bodies, i. 506. 

 ii. 4 ; on the polarization of, i. 453, 

 490, 492, 504. ii. 4, 7, 14, 33, 39, 

 50, 92, 104, 111, 122,366, 387, 394, 

 395, 407. 



Light and colours, theory of, i. 63. 



Light and heat : on the laws to which 

 they are subject, i. 23,30; from the 

 sun, on the causes or symptoms of 

 the variable emission of, i. 49, 55. 



Light and sound, experiments respect 

 ing, i. 8. 



Light-houses : intense light for, ii. 

 277 ; on the illumination of, ii. 41 1. 



Lime : muriate of, artificial cold pro- 

 duced by, i. 40; carbonate of, new 

 species of, i. 125. 



Linear measure : comparison of va- 

 rious British standards of, ii. 139, 

 150 ; on the error in standards of, ii. 

 409. 



Liquids : condensation of several 

 gases into, ii. 192 ; on the applica- 

 tion of as mechanical agents, ii. 193. 



Liquors,fermented : the state in which 

 spirit exists in, i. 408 ; the state in 

 which alcohol exists in, i. 450; of 

 Libavius, a new property of, i. 426. 



Lister (J. J.) on some properties in 

 achromatic object-glasses applicable 

 to the improvement of the micro- 

 scope, ii. 399. 



Lithic or uric acid, purpuric acid ob- 

 tained from, ii. 100. 



Lloyd ( J. A.), account of levellings car- 

 ried across the Isthmus of Panama, 

 ii. 385. 



Logarithms, method of computing, i. 

 239 ; on the construction of loga- 



VOL. II. 



rithmic tables, ii. 69; attempt to 

 rectify the inaccuracy of some loga- 

 rithmic formula?, ii. 365. 



Longitude : on the errors in, arising 

 from the action of the iron in ships, 

 ii. 130; trigonometrical operations 

 for determining the difference of be- 

 tween the Observatories of Green- 

 wich and Paris, ii. 335. 



Lubbock (J. W.) on the pendulum, ii. 

 401 ; researches in physical astro- 

 nomy, ii. 409. 



Luminous animals, on, i. 379. 



Lungs: on the black spots of the, i. 

 564 ; on the effects of galvanism in 

 restoring the due action of, ii. 55 ; 

 on the elasticity of the, ii. 121; on 

 the structure of the cells of, and the 

 office they perform in respiration, 

 ii. 303 ; on the effects of dividing the 

 nerves of, and influence of voltaic 

 electricity on the, ii. 320 ; on the 

 effects produced upon the air cells of, 

 when the pulmonary circulation is 

 too much increased, ii. 321. 



Lyndon, register of the barometer, 

 thermometer, and rain, at, for 1798, 

 i. 5. 



Lyrse, on the parallax of, ii. 93, 184, 

 222. 



M. 



Macartney (J.) on luminous animals, 

 i. 379 ; on the small intestines of 

 birds, i. 404. 



Machinery, on a method of expressing 

 by signs the action of, ii. 273. 



Madeira and Falmouth, observations 

 made with chronometers for ascer- 

 taining the longitude of, ii. 219. 



Madras, geographical situation of, ii. 

 176, 177. 



Magnesia, effects of in preventing an 

 increased formation of uric acid, i. 

 363, 469 ; on the manufacture of sul- 

 phate of at Monte della Guardia, ii. 

 48. 



Magnet, its action upon mercury, ii. 

 189, 208; upon metallic titanium, 

 ii. 199. 



Magnetic needle : observations made 

 at the Royal Society, on the variation 

 and dip of, i. 244 ; on the variation 

 of, i. 187. ii. 108, 109, 110, 130, 141, 

 197, 218, 225, 244, 293, 318, 321, 

 344, 347, 391 ; dip of the needle in 

 2 F 



