  The Nambu - Jona-Lasinio model in its SU(2) and SU(3) versions with scalar
and pseudoscalar coupling are applied to baryons. The parameters of the model
are fixed in the meson sector. The baryons arise as a soliton of three valence
quarks coupled to the Dirac sea (quark-antiquarks pairs). Within the SU(2)
version the nucleon static properties as well as some form factors, namely, the
electric and axial ones are described quite successfully. The nucleon-delta
splitting comes out reasonable. In medium the nucleonic soliton gets less
stable -- the mass is reduced whereas the radius increases. At some critical
medium density there is a clear delocalization of the soliton: The nucleon does
not exsist anymore as a soliton. In SU(3) version the strangness carrying
baryons are described as SU(3)-rotational excitations of the SU(2)-soliton
embedded in the SU(3)-sector. The mass splittings between the octet and
decuplet as well as within the multiplets are peproduced not only in a correct
oder but also in a good agreement with the experimantal values.
