  We present a calculation of the fourth-order (NLO) contribution to
spin-dependent Compton scattering in heavy-baryon chiral perturbation theory,
and we give results for the four spin polarisabilities. These results have been
presented before, in hep-ph/0002133. Here we address the issue of whether
one-particle reducible graphs in the heavy baryon theory contribute to the
polarisabilities.
