Absorption and Radiation, 309.
Absorption spectra, changes in, 177.
Air spectrum, the, 191.
Aldebaran, spectrum of, 328.
Alizarine, artificial spectrum of, 180.
Alkalies and alkaline earths, spectra of,
shown, 63.
Analysis of mineral waters, 106.
Ångström on the normal solar spec
trum, 272; on the spectra of com-
. pounds, 274.
Angstrom's maps of the metal lines,
Plate V. facing Lecture V.; tables of
solar lines, 453.
Apparatus used for star spectra, 324.
Aquarius, nebula in, 338.
Aqueous vapour in the planetary atmo-
spheres, 321.
Atmospheric absorption bands, 251.
Aurora borealis, spectrum of, 270, 275.
Barium, spectrum reactions of, 90.
Basis of solar chemistry, 223.
Becquerel, phosphorescence, 188.
Bessemer flame, spectrum of, 175, 215.
Betelgeux, spectrum of, 330.
Blood, absorption lines in, 181.
Blood-stains, discrimination of, 185.
Brewster and Gladstone, absorption
lines, 250.
Brewster on coloured flames, 103.
Brewster's monochromatic lamp, 101;
absorption bands, 177.
Brorsen's comet, 344.
Browning, new spark holder, 326;
automatic spectroscope, 456.
Bunsen and Kirchhoff, first Memoir on
spectrum analysis, 77; on the mode
of using a spectroscope, 94.
Bunsen, burner flame of, 55.
Bunsen on spectrum analysis, 77; dis-
covery of the new alkaline metals,
104; on a method of mapping spectra,
97; on erbium and didymium, 217.
Cesium and rubidium, discovery of,104;
reactions of, 106; spectra of, 107.
Calcium compounds, spectra of, 165.
Calcium, spectrum reactions of, de-
scribed, 85.
Calorescence, 13.
Carbon in comets, 344-404.
Carbon spectra, Plate facing Lect. VI.
Nos. 10, 11; figures of the, 174.
Carbon, spectrum of, 169, 210.
Chemical action of the constituent parts
of solar light, 43; chemical rays,
varying intensity of, 19.
Chemically active rays, 17, 229.
Chlorine and hydrogen exploded, 17.
Chromosphere, discovery of the, 258;
lines in the, 304.
Coincidence of bright iron and dark
solar lines, 239; of metallic lines,
122.
Coloured flames, early observations of,
101; spectra of, 55.
Coloured stars, 330.
Comet II. 1868, spectrum of, 345, 399.
Comets, spectra of, 344.
Complementary colours, 7.
Composition of white light, 7.
Compound bodies, spectra of, 165.
Compounds, spectra of, 207.
Continuous spectra from ignited gases,
Faculæ on the sun's surface, 263.
Faraday on the nature of the electric
spark, 114.
Fixed stars, constitution of, 328.
Fluorescence, 189.
Foucault's experiment, 231.
Fox-Talbot on spectra of coloured
flames, 102; on metal spectra, 118.
Frankland and Lockyer on spectra of
glowing gases, 208; on the atmo-
spheric pressure operating in a pro-
minence, 432.
Fraunhofer's discovery and map, 28;
conclusion as to cause of dark lines,
30; observations on planet light,
223; lines produced artificially, 233.
Huggins and Miller, extract from Me-
moir by, 359.
Huggins' maps of the metallic lines,
Plates I. and II. following Lecture
III.; description of, 125.
Huggins on the spectra of the elements,
140; on the red solar prominences,
301; on the motion of stars, 349
et seq.; on the spectra of stars and
nebulæ, 349 et seq.; on comets, 374
et seq.
Hydrogen compared with nebular spec-
trun, 344; lines, broadening of, 163 ;
spectrum, description of, 192; spec-
trum of, Plate facing Lecture VI.
No. 8.
Ignited gases sometimes give continuous
spectra, 154.
Incandescent solids, spectrum of, 51.
Increase of heat, effect of, on gases,
208 on solids, effect of, 51.
Indium, discovery of, 112.
Intensity of heating, luminous, and
chemical rays, 12.
Iron in the solar atmosphere, 241.
Janssen, lines of terrestrial absorption,
251; on the red prominences, 261.
Jupiter, absorption lines in spectrum
of, 322.
Kirchhoff and Bunsen on the spectra of
the new alkalies, 104.
Kirchhoff on the history of spectrum
analysis, 132; extracts from Memoir
by, 207; discovery of metals in the
sun, 243.
Kirchhoff's maps of the metal lines,
Plates III. and IV. facing Lecture
V.; most delicate spectroscope, 62;
description of, 94; discovery, 230;
tables of position of the solar lines,
438 et seq.
Lamy, preparation of thallium, 111.
Light, decomposition of white, 5.
Lightning, spectrum of, 191.
Magnesium wire, light from burning, 41.
Mapping the spectra, 97.
Maps of the metallic lines, Huggins, fol-
lowing Lect. IV.; of stellar spectra,
328; of the metallic lines, Kirchhoff,
facing Lecture V.
Mars, spectrum of, 322; on the spec-
trum of, 368.
Measurement of the chemical action in
solar spectrum, 43.
Measurement of the lines, 227.
Melville on the yellow soda flame, 101.
Memoirs on spectrum analysis, list of,
457.
Metallic lines mapped by Kirchhoff,
Huggins, and Angstrom, 121; by
Thalén, 123.
Metallic lines shown on screen, 117.
Microscopic objects, prismatic examina-
tion of, 219.
Micro-spectroscope, description of the,
183; construction of the, 219.
Miller, W. Allen, on coloured flames,
104.
Mineral water containing the new
alkalies, 106.
Minerals examined spectroscopically,
Moon has no atmosphere, 320.
Motion of hydrogen storms in the sun,
355.
Motion of the stars ascertained, 349,
351.
Nebulæ, examination of light of, 336;
luminosity of, 336; spectra of the,
338; Huggins' latest observations of,
Spark spectrum, examination of, 121.
Spectra of the alkalies and alkaline
earths, see Frontispiece; thrown on
screen, 75; mode of mapping, 67;
description of a mode of mapping, 97;
of gases, 156; of nitrogen, 168; of
gases and solids, 208; of the first and
second order, Plücker, 191.
Spectroscope for star observations, 378,
414; on mode of using a, 94.
Spectroscopes, description of various,
58; of large size, 225.
Spectroscopic observations of the sun,
Spectrum analysis, delicacy of method,
69; advantages of, 93; application
of, to steel-making, 170.
Spectrum reactions of the alkalies and
alkaline earths, 77; of burning
sodium, 233; of nebulæ, 338.
Star clusters and nebulæ, 337; spectro-
scope, 324; outburst in T Coronæ,
335.
Stellar chemistry, 322; methods of
investigation, 324; spectra, see Chro-
molith. facing Lecture VI.
Stokes' blood bands, 181.
Stokes on the long spectrum of the
electric arc, 126, 229.
Variable stars, 333; spectra of, 373.
Venus, spectrum of, 322.
Wheatstone's metal lines, 116.
White light, composition of, 7.
Wollaston's discovery of dark solar
lines, 26.
Young, lines in chromosphere, 304.
Zodiacal light, spectrum of, 275.
Zollner, pictures of solar prominences,
261; reversing spectroscope, 351.
LONDON R. CLAY, SONS, AND TAYLOR, PRINTERS.
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