It was observed in this laboratory that the infrared spectra of many compounds, transparent in the region from 2.8 to 3.0 microns in both carbon tetrachloride and carbon disulfide solutions, showed a weak absorption band in this region when their infrared spectra were run as chloroform solutions (Chloroform, Mallinckrodt, Anal. Reag., 0.75% of ethanol added as a preservative), employing the same grade of chloroform in the reference cell. This fact precluded the use of chloroform as an infrared solvent when it was desired to detect small amounts of —OH or > NH in the 2.9 micron region.

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