Note 22 — SECTION IV. THE SOLAR SPECTRUM, SPECTRUM ANALYSIS, SPECTRA OF GASES AND VOLATILIZED MATTER, INVERSION OF COLOURED LINES, CONSTITUTION OF SUN AND STARS.
Reading edition
In γ Cassiopeiæ, Mr. Huggins has detected a second bright line in the red part of the spectrum. He has also found that these two bright lines agree in position with the two brightest lines of the spectrum of hydrogen, and may therefore be considered due to luminous hydrogen.