We propose 3 by 5 point maps of [OI] (63 microns) and [CII]
 (158 microns) emission, measurement of the [FeI] (24 microns),
 [SI] (25 microns), [FeII] (26 microns), [SiII] (35 microns),
 OH (119 microns), [OI] (146 microns), and CO J=14-13 (186 microns)
 lines, and the 40-196 micron continuum spectrum at the central
 position of the X-ray source 1E1740.7-2942. This is the purported
 compact, variable source of gamma-ray annihilation emission in the
 galactic center region. The purpose of these measurements is to
 determine whether 1E1740.7-2942 is embedded within a molecular cloud,
 and to test whether Bondi-Hoyle accretion onto an isolated compact
 object could power the observed X-ray and gamma-ray emission.
 We will accomplish this by probing the effect of the 1-100 keV X-rays
 on the molecular gas through measurement of the gas temperature,
 density, and chemical abundances.  These measurements will also probe
 whether a significant fraction of the positrons produced by the source
 escape the vicinity to power the steady, bulge component of the
 gamma-ray annihilation emission observed from the galactic center.