The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 224
Other forms aregiven in Figs. 218and 219. Their spectrumis usually very simple, consisting of the four lines of hydro-gen and the orangeD^: hence the ap-pellation hydfoge-noics. Occasionallythe sodium andmagnesium linesalso appear, evennear the tops ofthe clouds. 200.… … 202 ASTRONOMY. miles; but occasionally they rise far higher than even thelargest of the quiescent protuberances. Their spectrum isvery complicated, especially near their base, and often filledwith bright lines. The most conspicuous lines are those ofsodium, magnesium, barium, iron, and titanium:…
Astronomy
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