We present preliminary results on top quark physics recently
obtained by the CDF collaboration.  The data sample consists of 110 pb^-1 of
pbar p collisions at sqrt s = 1.8 TeV, collected with the Collider Detector at
Fermilab during the period 1992-1995.  We report on the ttbar production cross
section and on the top quark mass.  The measurements are made in three
topologies, corresponding to the decay modes of the Wb pairs in the final
state: lepton + multi-jets, dilepton and all hadronic final state.  The
analysis performed on the single lepton sample yields the most accurate
measurements, due to the good acceptance and the favourable signal to noise
ratio obtained after applying some b-tagging techniques.  In this channel we
measure:

                      sigma_tt-bar = 6.8^+2.3_ -1.8 pb

               M_t = 175.6 +/- 5.7 (stat) +/- 7.1 (syst.) GeV/c^2

Combining the cross sections measured with the lepton + multi-jet and dilepton
data we obtain:

                       sigma_tt-bar = 7.5^+1.9_ -1.6 pb

A preliminary investigation of the production mechanism of the tt-bar system
is shown and compared to Standard Model expectations.