  Polarimetry in the far-infrared and submillimeter has been valuable in
tracing magnetic fields in bright Galactic Clouds. We discuss the techniques we
have developed and trends we have found in polarization vs column density, and
vs wavelength. The polarization spectrum has proven to be more interesting than
had been anticipated. It is potentially valuable in explaining grain alignment
and in characterizing dust species. One can expect the infrared cirrus to be a
much simpler environment than the molecular clouds that have heretofore been
explored at multiple wavelengths. Although cirrus observations must deal with
low signals and wide extent, it is becoming possible to measure accurately the
spectral energy distribution from mid-infrared to microwave frequencies and it
should soon become feasible to determine the polarization spectrum over the
same range.
