easy to generalize all the
results for the case where $\epsilon$ and $\mu$ are tensors of second rank. No
essentially new results should be obtained for this case, but the corresponding
relations are more cumbersome.
\par

    Finally, we would like to note that the problem considered is related
to some old questions about the electromagnetic forces acting to the body,
some specific features of electrodynamics in moving media,
the form of electromagnetic stress tensor in condensed matter,
the role of momentum and quasimomentum etc. Since we
 derive the full set of dynamics equations all the forces are taken
into account in a selfconsistent way.
\par
    The paper is organized in the following way. In Sec. 2. we introduce
new variables (discrete coordinates and ivariant quasimomentum),
write evolution equations for
lattice vectors in the real and reciprocal spaces and express in new notation
metrical tensors, deformation tensor etc.
In Sec. 3. we reproduce briefly some of our previous results on
the Hamilton eqs. and kinetic equation we need for this work.
In Sec. 4 we deduce the full set of equations which describes the behaviour of
quasiparticles in deformable solids in electromagnetic fields.

\section{ Notation }
\label{sec:notation}

Following our previous works 