450 



INDEX 



Boisbaudran, Lecoq de, 370 

 Brewster, believed some lines due to 



absorption at sun, 44 

 idea of lines in solar spectrum due 



to earth's atmosphere, 64 



map of solar spectrum, 34, 38 



work on nitrous acid gas, 43 



Brodie's suggestion on elements, 207 



treatment of chemical phenomena, 



206 



Bromine vapour, spectrum of, 284 

 Bunsen burner, use of, 28 

 Bunsen's statement on the variations 

 of intensities of lines due to tempera- 

 ture, 178 



C. 



Cadmium in sun, 158 



Calcium, H and K lines of, 245 ; how 



traced to, 226 

 blue line of, 299 

 effect of temperature on spectrum 



of, 241 

 lines in spots and prominences, 



376 



spectrum of, 380 ; Young, 195 ; in 

 arc, 385 ; in stars, Huggins, 246, 

 248 

 solar and terrestrial evidence of, 



244 

 variations of intensity of lines in, 



194 



Carbon, combinations of, with hydro- 

 gen, 264 



Carbons, spectrum of, 384 

 Carrington, 426, 430, 431 

 Cell, transparent, 40 

 Cerium, in sun, 158 



complicated spectrum of, 401 

 Chemistry, solar, basis of, 34 

 first steps in, 10 

 stellar, founded by Fraunhofer, 



186 



Chlorine vapour, absorption of, 280 

 Chromosphere, 110 



contortions of lines in, 132 

 iron lines in spectrum of, 335 

 method of observing whole at once, 



Seabroke and Lockyer, 114 

 shape of edge, 116 

 spectrum of hydrogen prominent, 



term suggested by Sharpey, 110 



varies considerably, 111 



Young's observation on spectrum 



of, 335 

 Ciamician, 370 



Cobalt in sun, 89 



Collisions in solar atmosphere, 406, 



441 



Colours, sunset, phenomena of, 37 

 Comparison of spectra, description 



of, 215 



spectra of sun and sun-spot, 254 

 of sun-spot and prominences, 343 



et seq. 



Compounds, spectra of, 159 ; con- 

 clusion on, Mitscherlich, 159 

 Contortions of F line on disc, 122 

 of lines, explanation of, 137 ; 



Huggins, 133 ; Secchi, 133 

 in spectrum of chromosphere, 132 ; 



of sun-spots, 348 

 Copper present in solar atmosphere, 



77 

 Core, flame of, and arc compared, 386 



of arc, lines seen in, 383 

 Cornu, 379 

 Corona, 96, 443 



conclusion as regards the, New- 

 ton's, 367 



constitution of, 365 

 in 1874, in 1878, in 1882, in 1886, 



365 



observations on, earliest, 364 

 spectrum of, 364 

 D line in, 365 

 Crookes, 401 

 Crucibles, Messrs. Li veing and Dewar's 



work with, 392 

 Currents, electric, used as explorers, 



295 



in solar atmosphere, 303 

 direction of, 432, 436, 437 

 velocity of, 432, 437 

 Cycle of sun-spots, 430, 434 



D. 



D alt on, 270 



De la Rue, Stewart, and Loewy's 



theory on sun-spots, 101, 406 

 Density of sun, 403 



Venus and Mare, 403 

 vapour, 269, 281 ; anomalous, 282 

 Deviation minimum, 10 

 Dewar. See Liveing and Dewar 

 Diffraction gratings 



Angstrom's reason for employing, 



86 



Mascart's reason for employing, 86 

 Disturbances in solar atmosphere, 



how produced, 406 

 Domes, 412, 418 



