  Parity nonconservation led Lee and Yang (1956) to the hypothesis of
additional fermions with properties that mirror those of usual particles. It is
shown here that the well-known observed qualitative structure of the quark
mixing matrix (CKM matrix) is precisely reproduced when usual quark mass
hierarchies result from mass hierarchies of heavy mirror generations. The last
ones are of the Lee--Yang type only. The usual quark spectrum is formed
likewise the see--saw spectrum of the neutrino physics. The lightest mirror
quark is closely related with the t quark and might be available even in a
region below 1 TeV.
