  Gas supplied conservatively to a black hole at rates well below the Eddington
rate may not be able to radiate effectively and the net energy flux, including
the energy transported by the viscous torque, is likely to be close to zero at
all radii. This has the consequence that the gas accretes with positive energy
so that it may escape. Accordingly, we propose that only a small fraction of
the gas supplied actually falls onto the black hole and that the binding energy
it releases is transported radially outward by the torque so as to drive away
the remainder in the form of a wind. This is a generalization of and an
alternative to an "ADAF" solution. Some observational implications and possible
ways to distinguish these two types of flow are briefly discussed.
