  Applications of the chiral expansion to generalize the Gerasimov-Drell-Hearn
sum rule for finite $Q^2$ are discussed. The observation of several authors
that the corrections to the leading order contributions are large and limit the
applicability to a very small range in $Q^2$, are valid when considering the
sum rule for protons and neutrons, separately. When using the proton-neutron
difference, the chiral expansion may be valid to considerably higher momentum
transfers where hadronic degrees of freedom at large distances may connect up
with quark and gluon degrees of freedom. This could mark the first time that
nucleon structure is decribed by fundamental theory from large to small
distances.
