The infra-red absorption bands of hydrogen sulphide in the regions of 4.2, 5.6, and 8.0{μ} were investigated by means of a prism-grating spectrometer. A narrow, intense absorption band was observed at 4.2{μ}, but could not be resolved. The 5.6{μ} band observed by Coblentz was not found. Evidence is presented to show that the band observed by Coblentz might have been due to an impurity. Thirty-four lines of the band in the region of 8.0{μ} were observed.
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A. H. Rollefson (1929) studied this question.
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