  We study the effect of mesoscopic fluctuations on a magnetic impurity coupled
to a spatially confined electron gas with a temperature in the mesoscopic range
(i.e. between the mean level spacing $\Delta$ and the Thouless energy $E_{\rm
Th}$). Comparing ``poor-man's scaling'' with exact Quantum Monte Carlo, we find
that for temperatures larger than the Kondo temperature, many aspects of the
fluctuations can be captured by the perturbative technique. Using this
technique in conjunction with semi-classical approximations, we are able to
calculate the mesoscopic fluctuations for a wide variety of systems. For
temperatures smaller than the Kondo temperature, we find large fluctuations and
deviations from the universal behavior.
