  A description is made of the process of excitation of bound
longitudinal-transverse gravitational waves during the propagation of
electromagnetic waves in a dielectric medium. It is shown that the speed of
such gravitational waves is less than the speed of light in a vacuum and
coincides with the speed of an electromagnetic wave in matter. A description of
the propagation of a bound gravitational waves in a dielectric in the presence
of a constant magnetic field is suggested as well. It is claimed that these
gravitational waves in a dielectric medium are forced ones and they cannot
exist in a free state.
