  The Red-Sequence Cluster Survey (RCS) is a 100 deg$^2$ optical survey for
high-redshift galaxy clusters. One of the goals of the survey is a measurement
of $\Omega_m$ and $\sigma_8$ via the evolution of the mass spectrum of galaxy
clusters. Herein we briefly describe how this will initially be done, and also
demonstrate the eventual power of the RCS for this type of measurement by a
qualitative analysis of the first 1/10th of the survey data.
