Gravitational lensing is one of a number of methods used to probe the
distribution of dark mass in the Universe. On galactic scales, complementary
techniques include the use of stellar kinematics, kinematics and morphology of
the neutral gas layer, kinematics of satellites, and morphology and temperature
profile of X-ray halos. These methods are compared, with emphasis on their
relative strengths and weaknesses in constraining the distribution and extent
of dark matter in the Milky Way and other galaxies. It is concluded that (1)
the extent of dark halos remains ill-constrained, (2) halos need not be
isothermal, and (3) the dark mass is probably quite flattened.Comment: Invited Review at IAU Symposium 173, "Gravitational Lensing,"
Melbourne, July 1995, eds. C. Kochanek and J. Hewitt. 10 pages, 1 Postscript
Figure. A few typos have been corrected and a few references adde
