  A semi-classical model of the screening of electric charge by virtual
electric dipoles, as found in electrodynamic theory, will be presented. This
model is then applied to the hypothetical case of an electric force where like
charges attract. The resulting anti-screening of the electric charge is found
to have the same functional dependence on the field source and observation
distance that is found with the Baryonic Tully-Fisher Relationship. This leads
to an anti-screening model for the gravitational force which is then used to
determine the theoretical rotational curve of the Galaxy and the theoretical
velocity dispersions and shear values for the Coma cluster. These theoretical
results are found to be in good agreement with the corresponding astronomical
observations. The screening of electric charge as found in QED and the larger
apparent masses of galaxies and galactic clusters therefore appears to be two
sides of the same coin.
