  The summation of logarithmic contributions to perturbative radiative
corrections in physical processes through use of the renormalization group
equation has proved to be a useful way of enhancing the information one can
obtain from explicit calculation. However, it has proved difficult to perform
this summation when massive fields are present. In this note we point out that
if the masses involved are quite large, the decoupling theorem of Symanzik and
of Appelquist and Carazzone can be used to make the summation of logarithms
possible.
