We report Monte Carlo (MC) simulations for the pair correlation functi
ons of a hard sphere fluid in a hard sphere matrix. In particular, we
evaluate the blocking function h(b)(r) which is that part of the fluid
pair correlation function which accounts for the correlation between
fluid particles mediated through at least one matrix particle. The res
ults are compared with integral equation theory. A scheme for determin
ing the bridge functions is presented which predicts excellent agreeme
nt of the pair structure with MC results. (C) 1996 American Institute
of Physics.