Spin polarisabilities of the nucleon at NLO in the chiral expansion

We present a calculation of the fourth-order (NLO) contribution to nspin-dependent Compton scattering in heavy-baryon chiral perturbation theory, nand we give results for the four spin polarisabilities. These results have been npresented before, in hep-ph/0002133. Here we address the issue of whether none-particle reducible graphs in the heavy ..