We previously disscussed the influence of Mn addition on the positive temperature coefficient (PTC) effect of BaTiO₃ ceramics using Jonker's model. Jonker derived his model from a “jump” of the resistance at the Curie temperature ; however, a “jump” was not observed by us. The distribution of the Curie temperature, T_c of each grain was estimated by experiment and simulation. The permittivity peak was observed at 6 K-above the pyroelectric current peak. Such a peak shift was simulated only when the T_c distribution was assumed. The disappearance of a “jump” can be attributed to the T_c-distribution of our specimens.