  Allowing the energy of a gravitational field to serve partially as its own
source allows gravitating bodies to exhibit stronger fields, as if they were
more massive. Depending on degree of compaction of the body, the field could be
one to five times larger than the newtonian field. This is a comfortable range
of increase in field strength and may prove to be of convenience in the study
of velocity curves of spirals, of velocity dispersions in clusters of galaxies
and in interpreting the Tully-Fisher or Faber-Jackson relations in galaxies or
systems of galaxies. The revised gravitation admits of superposition principle
but only approximately in systems whose components are widely separated. The
revised dynamics admits of the equivalence principle in that, the effective
force acting on a test particle is derived from a potential, and could be
eliminated in a freely falling frame of reference
