BaTiO3-doped (5-40 wt%) 90V(2)O(5)-10Bi(2)O(3) (VB) glasses have been prepared by a quick quenching technique. The d.c. electrical conductivities, sigma(d.c.,) of these glasses have been reported in the temperature range 80-450 K. The electrical conductivity of these glasses, which arises due to the presence of V4+ and V5+ ions, has been analysed in the light of the small-polaron hopping conduction mechanism. The adiabatic hopping conduction valid for the undoped VB glasses (with 80-95 mol% V2O5), in the high-temperature region, is changed to a non-adiabatic hopping mechanism in the BaTiO3-doped VB glasses. At lower temperatures, however, a variable range hopping (VRH) mechanism dominates the conduction mechanism in both the glass systems. Such a change-over from adiabatic to non-adiabatic conduction mechanism is a new feature in transition metal oxide glasses. Various parameters, such as density of states at the Fermi level N(E(F)), electron wave-function decay constant, alpha, polaron radius, r(p), and its effective mass, m(p)*, etc., have been obtained for all the glass samples from a critical analysis of the electrical conductivity data satisfying the theory of polaron hopping conduction.