INSUFFICIENCY OF THE UNIFIED SCHEME FOR C LASSIFYING ACTIVE GALACTIC NUCLEI

By comparing properties of various kinds of active galactic nuclei, of their host galaxies and of their environments, a conclusion is made a bout impossibility to explain the observed great variety of AGN by var iations of radio jet orientation with respect to the line of sight and /or by variations of radio jet relativism (the ''unified scheme''). It concerns particularly the nature of the progenitors of BL Lac-like ob jects and radio-loud quasars, namely of radiogalaxies of FRI and FRII types, correspondingly. A new ''extended unified scheme'' is proposed.