Light and heat, _S. Morey_, ii, 118, 122. ---- and magnetism, connexion between, _G. Gibbs_, i, 89. ----, observations and experiments on, _S. Adams_, xlii, 123. ----, absorption of, by the atmosphere, xlvi, 201. ----, action of, chemical, xvii, 376. ----, ----, in producing chemical changes, _J. W. Döbereiner_, xxii, 352. ----, ----, in decomposing carbonic acid and alkaline carbonates, _J. W. Draper_, xlvi, 398. ----, ----, on the color and movement of plants, _D. P. Gardner_, xlvi, 1.^f ----, ----, on an elementary substance, producing, as supposed, a change, _J. W. Draper_, xlvi, 390. ----, ----, on an iodized silver plate, producing electricity, xlvii, 190. ----, ---- of solar spectrum, chemical, xxxi, 260. ----, ---- ---- ----, on sensitive paper, _J. F. W. Herschel_, xxxviii, 110. ----, ---- of gaseous and other media on the solar spectrum, xlii, 157. ----, blanching effects of, obviated, xxxv, 338. ----, halo of, which surrounds all bodies, _Mary Griffith_, xxxviii, 22. ----, influence of, on germination, _R. Hunt_, xliv, 352. ----, ----, on the growth of plants, xliv, 352; xlvi, 397. ----, intensity of, how measured, xv, 184. ----, new case of interference of, _Powell_, xxxviii, 107. ----, apparatus for experiments on inflection and interference of, _E. S. Snell_, xlix, 26.^f ----, latent, _J. W. Draper_, xliv, 202. ---- lines seen at regular intervals, a new property, _D. Brewster_, xxxiv, 20. ----, magnetic influence of the violet ray of, xviii, 171. ----, ---- ---- of the solar rays, xiii, 188. ----, on the deflection of, xviii, 176. ----, monochromatic, for microscopic observations, xiii, 190. ----, oxy-hydrogen, for light-houses, improvement in, by use of sulphate of lime, xxviii, 355. ----, a new kind of polarity in homogeneous, _D. Brewster_, xxxv, 292. ----, polarization of, by reflection, _D. Brewster_, xxii, 277.^f ----, ----, by refraction, laws of, _D. Brewster_, xxiii, 225.^f ----, ----, elliptic, of reflected, _Powell_, xliv, 171; xlvi, 390. ----, ----, rings produced in specimens of decomposed glass, _D. Brewster_, xl, 325. ----, on the passage of, through small apertures, and on the cause of prismatic analysis, _C. C. Conwell_, xx, 350. ----, on the production of, _R. Hare_, ii, 172. ----, ----, _J. L. Sullivan_, i, 91.^f ----, ----, from quicklime, xiv, 385. ----, ----, ibid, for geodetical operations, xiii, 188. ----, on the production of, from quicklime, for light-houses, _T. Drummond_, xxi, 366. ----, reflection of, from different surfaces, _Potter_, xxviii, 59. ----, action of second surfaces of transparent plates on, _D. Brewster_, xxiii, 28.^f ----, solar, curious effect of, xii, 164. ----, ----, as compared with that of the moon and fixed stars, xvii, 362. ----, ----, chemical action of, see above. ----, zodiacal, see _Zodiacal_. Lights, northern, see _Aurora Borealis_.