  We summarize a recent work on the title subject, skipping the detailed
calculations but introducing the basic points with enough detail. The theory
considered is formulated in a preferred reference frame in a four-dimensional
spacetime endowed with a curved "physical" metric. The dynamics of a test
particle is defined by an extension of the special-relativistic form of
Newton's second law. This determines the dynamical equation verified by the
energy-momentum tensor ${\bf T}$ of a "dust" continuum, also in the presence of
a non-gravitational external force. The dynamical equation for ${\bf T}$ thus
obtained is assumed valid for a general continuous medium or a system of
fields. When the non-gravitational force is the Lorentz force, this equation in
turn determines the Maxwell equations in a gravitational field for the present
theory. They are consistent with the dynamics of photons i.e. with the
geometrical optics of the theory. Except for a constant gravitational field,
they seem to imply some local production or destruction of electric charge. The
possible amounts are yet to be assessed.
