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In this paper it is shown that the continuous absorption coefficient of the negative hydrogen ion is most reliably determined by a formula for the absorption cross-section which involves the matrix ele- ment of the momentum operator. A new absorption curve for H has been determined which places the maximum at X 8500 A; at this wave length the atomic absorption coefficient has the value 4.37 X 1O-'~ cm2
S. Chandrasekhar (Sat,) studied this question.