The mid- to far-infrared region contains a wealth of diagnostic
 spectral features but is basically unexploited in the study of
 asteroid surface composition.  We propose to study the composition
 of primitive asteroids by obtaining low resolution spectra in the
 range 2-45 microns.  The observations will yield insights into the
 composition, mineralogy, physical nature and distribution of solid
 materials on the surfaces of asteroids.  We will also observe a few
 more evolved asteroids ("C-type") for comparison. With these
 observations, we wish to investigate dark, volatile-rich asteroids
 and their relation to comets, believed to be among the most
 primitive objects of the solar system.