  The peculiar radial velocities of eight clusters of galaxies, as determined
from a variety of distance indicators, are consistent with a bulk flow not
greatly different in direction and magnitude from the velocity vector of the
Local Group relative to the microwave background radiation. The bulk flow
vector is directed to l=266+-18 deg, b=17+-15 deg with a magnitude of 788+-113
km/s. N-body simulations of gravitationally induced peculiar motions from a set
of over 1000 clusters of known redshift give reasonably good agreement for the
peculiar velocites of the Local Group and Virgo, both in magnitude and
direction. Most of the accelerating mass lies within about 40h^-1 Mpc but more
distant clusters are necessary to fully account for the magnitude and
direction.
