296 R. Meldola—Bright Lines in the Solar Spectrum. 
would be the case, the temperature of the said region of com- 
bustion is lower than that of, the photosphere], because the 
light radiated by the latter has undergone almost its maximum 
amount of weakening before reaching the zone of combustion, 
not only on account of the distance of this last region from the 
photosphere, but also because of the absorption, both selective 
and general, which the light has undergone in passing through - 
the intervening reversing layer and chromos s 
9. We have next to turn our attention to that part of the 
the most sensitive radiative organization have likewise the most 
sensitive absorptive organization. 
11. The non-metals are distinguished, as a group, from the 
g 
thus have a mixture of two vapors, one metallic and the other 
non-metallic, at the temperature of incandescence, the former 
giving a line spectrum and the latter a band spectrum. If we 
imagine the temperature of such a mixture of vapors to be 
raised to the point at which the band spectrum of the non- 
* Pogg. Ann., cxxxix, 628 (1870). 
