  We prove an effective bound for the degree of a smooth divisor of a
hypersurface of P^n, n>4 (projective space over an algebraically closed field
of characteristic zero). Our result follows from a strong (since the degree of
the divisor is not involved) generalization of the "Speciality theorem" of
Gruson-Peskine, which we prove to hold for any smooth, subcanonical,
codimension two, projective verieties of dimension at least three.
