  We present the results of a neutral hydrogen survey conducted with the Green
Bank 140-foot radio telescope of 47 northern objects in the polar-ring galaxy
atlas of Whitmore \etal\ (1990). We detected 39 of these above our detection
limit of 1.7 \hbox{Jy\CDOT\KMS}; the average measured flux of 21 Jy\CDOT\KMS\
corresponds to an average neutral hydrogen mass of $\rm 5.3 \times 10^9$ \MSUN
for a Hubble constant of $\rm H_0 = 75$ \KMS \ Mpc$^{-1}$. For the polar-ring
galaxies in our sample that have also been observed with radio arrays, we find
that the 21\AMIN\ (FWHM) Green Bank beam often includes much more flux than
found by the synthesis instruments for the polar rings alone; some of these
galaxies are known to have gas-rich companions. We compare the neutral hydrogen
content of the sample to the blue luminosity and IRAS fluxes. The \HI-to-blue-
light ratios of the confirmed and probable polar rings are around unity in
solar units, indicating that polar ring galaxies (or their environments) are as
gas-rich as typical irregular galaxies. For their blue luminosity, the
confirmed polar rings are underluminous in the far-infrared, as compared with
the rest of the sample. They are also FIR-underluminous for their \HI\ masses,
which suggests that most of the gas in the ring may be in stable orbits, rather
than flowing inward to trigger star formation in the central galaxy. The more
disordered class of `related objects,' which includes a number of obvious
mergers, is highly luminous in the far-infrared.
