  I use an interpolating formula introduced by Guerra and Toninelli to
investigate numerically the finite size corrections to the free energy of the
Sherrington--Kirkpatrick model. The results are compatible with a $(1/12 N)
\ln(N/N_0)$ behavior at $T_c$, as predicted by Parisi, Ritort and Slanina, and
a $1/N^{2/3}$ behavior below $T_c$.
