  Early-type galaxies from CfA catalogue were assotiated with IRAS FSC sources.
In given sample IR and optical properties were used to obtain some
classification of these objects. The existance of significant classes can be
evidence of presence one main type of the dust in each galaxy. Physical
interpretation of obtained classes was discussed. The dust mass in two classes
of galaxies can be calculated using evolution modelling. In this case we can
obtain a estimations for chemical composition and initial mass function in
these galaxies.
