  We have found a dramatic change in the spectra of late-type M dwarfs at
wavelengths shorter than 0.75 microns. Comparisons with synthetic spectra
illustrate that this change is well explained by the presence of dust. It thus
seems that a substantial part of the long-standing discrepancies between
late-type M dwarf models and observations arises from dust as recently proposed
by Tsuji, Ohnaka and Aoki (1996a).
