  We report progress in the calibration of a method to determine cool dwarf
star metallicities using molecular band strength indices. The molecular band
index to metallicity relation can be calibrated using chemical abundances
calculated from atomic line equivalent width measurements in high resolution
spectra. Building on previous work, we have measured Fe and Ti abundances in 32
additional M and K dwarf stars to extend the range of temperature and
metallicity covered. A test of our analysis method using warm star - cool star
binaries shows we can calculate reliable abundances for stars warmer than 3500
K. We have used abundance measurements for warmer binary or cluster companions
to estimate abundances in 6 additional cool dwarfs. Adding stars measured in
our previous work and others from the literature provides 76 stars with Fe
abundance and CaH2 and TiO5 index measurements. The CaH2 molecular index is
directly correlated with temperature. TiO5 depends on temperature and
metallicity. Metallicity can be estimated to within plus or minus 0.3 dex
within the bounds of our calibration, which extends from roughly [Fe/H] = +0.05
to -1.0 with a limited extension to -1.5.
