  The author and Shmuel Friedland recently presented an expression for
lambda_d(p) of the monomer-dimer problem involving a power series in p . Herein
I present a simple way to derive this expression for lambda_d(p) from the Mayer
(or Virial) series of a dimer gas. The derivation is an exercise in basic
statistical mechanics. We expect the relationship to be very useful.
