In an attempt to replicate some early experiments which had shown consistent between-Ss changes in time estimation with increases in body temperature, Ss in the present experiments were required to count to 60 at an estimated rate of 1 digit/sec, tap a Morse key at an estimated rate of 3 taps/sec, and judge when a metronome was beating at 4 beats/sec. Body (oral) temperatures were raised by immersion of both legs below the knees in a bath of warm water. These trials were given at each task at 3 levels of body temperature. The results of the original experiments were not confirmed.