—, —, 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.