The top search in the dilepton and lepton plus jets channels with the Collider Detector at Fermilab is presented. The analysis uses a 67 pb^-1 sample of ppbar collisions at 1.8 TeV. A 4.8 sigma excess of candidate events establishes the existence of the top quark. The ttbar production cross section is measured to be sigma_ttbar = 7.6^+2.4_ -2.0 pb with branching Br(t -> Wb) = 0.87^+0.13_ -0.30(stat) ^+0.13_-0.11(syst). The measured mass is M_top = 176 \pm 8 \pm 10 GeV.