  A quantitative application to real supercooled liquids of the mean-field
scenario for the glass transition ($T_g$) is proposed. This scenario, based on
an analogy with spin-glass models, suggests a unified picture of the
mode-coupling dynamical singularity ($T_c$) and of the entropy crisis at the
Kauzmann temperature ($T_K$), with $T_c>T_g>T_K$. Fitting a simple set of
mode-coupling equations to experimental light-scattering spectra of two fragile
liquids and deriving the equivalent spin-glass model, we can estimate not only
$T_c$, but also the static transition temperature $T_s$ corresponding
supposedly to $T_K$. For the models and systems considered here, $T_s$ is
always found above $T_g$, in the fluid phase. A comparison with recent
theoretical calculations shows that this overestimation of the ability of a
liquid to form a glass seems to be a generic feature of the mean-field
approach.
