  The low-energy theorem for the forward Compton scattering is generalized to
the case of an arbitrary target spin. The generalization is used to calculate
the corresponding contribution to the deuterium hyperfine structure. The
nuclear-structure corrections are quite essential in this case due to the
deuteron large size. Corrections of this type calculated here remove the
discrepancy between the theoretical and experimental values of the deuterium
hyperfine splitting. Explicit analytical result is obtained also for the
deuteron polarizability contribution to the Lamb shift.
