392 Huggins and Miller on the Spectrum of a new Star. 
mosphere of cooler vapors, which give rise by absorption to the 
groups of dark lines. ' 
Besides this constitution, which it possesses in common with 
the sun and the stars, there must exist the source of the gaseous 
spectrum. That this is not produced by the faint nebulosity 
seen about the star is evident by the brightness of the lines, and 
the circumstance that they do not extend in the instrument be- 
gibi 
The character of the spectrum of this star, taken together 
the absorption Spectrum of the new star, The whole class of 
7 On the dependenee of the relative characters of the bright lines of hydrogen 
— oa of pressure and temperature, see Pliicker ty Hittorf, Phil, Trans., 
