  We consider particles in $\R^d, d \geq 2$ interacting via attractive pair and
repulsive four-body potentials of the Kac type. Perturbing about mean field
theory, valid when the interaction range becomes infinite, we prove rigorously
the existence of a liquid-gas phase transition, when the interaction range is
finite but long compared to the interparticle spacing for a range of
temperature.
