  We give a precise numerical solution for decorated Ising models on the simple
cubic lattice which show ferromagnetism, compensation points, and reentrant
behaviour. The models, consisting of $S={1\over 2}$ spins on a simple cubic
lattice, and decorating S=1 or $S=3/2$ spins on the bonds, can be mapped
exactly onto the normal spin-1/2 Ising model, whose properties are well known.
