  Linear recursion relations for the instanton corrections to the effective
prepotential are derived for N=2 supersymmetric gauge theories with one
hypermultiplet in the adjoint representation of SU(N) using the Calogero-Moser
parameterization of the Seiberg-Witten spectral curves. S-duality properties of
the Calogero-Moser parameterization and conjectures on the Seiberg-Witten
spectral curves generalized to arbitrary simply laced classical gauge groups
are also discussed.
