AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
ArT. XXXVII.—Spectroscopie Notes, 1879-80; by Professor 
C. A. Young, Princeton, N. J. 
I. Double reversal of lines in Chromosphere Spectrum. 
THE magnesium lines of the } group, and the two D-lines of 
sodium have been seen several times (first on June 5, 1880) 
doubly-reversed in the spectrum at the base of a prominence. 
shown in the figure. The phenom- 
sal of the bright sodium lines, ob- 
servable in the flame of a Bunsen 
burner or alcohol lamp under cer- 
tain circumstances when the quan- 
tity and temperature of the sodium vapor in the flame are 
greatly increased. 
Il. The H-lines in the Chromosphere and Sun-spot Spectra. 
In 1872, I found the H- and K-lines to be reversed in the 
Spectra of prominences and sun-spots, as observed at Sherman, 
8,000 feet above the sea. Until recently I have not been able 
Am. Jour. em ar psi Vou. XX, No. 119.—Nov., 1880. 
