  The contribution of mesonic exchange currents to nuclear Compton scattering
is investigated within the framework of a Fermi gas model of nuclear matter in
the non-relativistic limit. The additional interaction between the nucleons is
accounted for by including two- and three-body diagrams. As a test of this
model, the enhancement constant $\kappa $ is calculated. The full correlators
for the central and tensor part of the nucleon-nucleon interaction due to pion
exchange are obtained and the energy dependence of the amplitude is
investigated. The contribution of the $\Delta $-excitation to the mesonic part
of the Compton amplitude is calculated explicitely using an effective
Hamiltonian in the static limit.
