THE occurrence of a broad interstellar band in the ultraviolet at 2200 A (45,000 cm–1) has been confirmed by Nandy and Seddon1. They showed that the greater the height of the 2200 A feature the greater is the reddening Δ (B-V), which in turn is related to the intensities of the optical interstellar bands. These latter bands have been assigned2 to d-d transitions within Fe2+ and Fe3+ ions in silicates, in particular almandine and Si-substituted andradite garnets. The resolution of an interstellar band at 2200 A indicates that the fundamental absorption edge of the host material lies at shorter wavelengths, which eliminates, as a cause of the 2200 A band, the above garnets and also Fe-bearing silicates such as olivine3 with band-gaps of 30,000–35,000 cm−1.