On the Density Distribution and Chemical Composition of the Interstellar Gas.

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Abstract
Observational data on interstellar absorption lines and emission lines are analyzed with a view to obtaining information on the density distribution and chemical composition of the interstellar gas. Sec- tion III deals with problems of the theoretical curves of growth of interstellar absorption lines. The theory of ionization in interstellar space is treated in Section IV. Correction factors to the Saha-Eddington equa- tion of ionization are obtained. The numerical values of the correction factors for Na i, K i, Ca i, and Ca ii range from 2.6 to 1600. In Section V the problem of the extent of the regions of ionization of hydro- gen in interstellar space is considered. The results obtained in Sections 111-V are utilized in the following sections, in an attempt to derive the gas density between interstellar clouds (Sec. VI), in the average cloud (Sec. VII), and in abnormal clouds, such as that producing the interstellar lines in x2 Orionis (Sec. VIII). [n the last-mentioned case the problem of the chemical composition is also discussed

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