  We discuss how the possible changes of hadron properties can be tested,
associated with the chiral transition in nuclear medium; the hadrons discussed
are the vector mesons,the $\sigma$ meson and the chiral partner of the nucleon.
We emphasize that the proper quantity is the spectral function which describes
the nuclear medium having a hadron; the analysis of electro-quasielastic
reactions, for instance, has a relevance to the physics of CERES. The
similarity is indicated between the physics discussed here with that of giant
resonances. Experiments using nuclear targets are proposed to observe the
$\sigma$ meson and to explore how the partial chiral restoration in nuclear
medium manifests itself.
