In a recent paper by Mr. Parkinson and myself (Loudness and Intensity Relations, J.A.S.A. 3, 511–534 (1932)), a series of experiments were described concerning the comparison of the loudness of one tone with a fixed tone of the same frequency characteristics. The present series of experiments are similar except being confined mostly to low tones between 60 and 500 cycles per second. Present experiments carried out with the same frequencies and under similar experimental conditions as the former series yielded similar results. In the very low frequencies, the value ofnobtained for the equation used in the former series is larger, which means that the decibel intervals for corresponding loudnesses are smaller. Certain experimental factors, however, have appeared in the present experiments that did not appear in the previously published data due, in part apparently, to differences in experimental technique. We did not find any noticeable effects in the very few experiments tried in the previous series on interchanging the order of the energy decreases. Interchanging the order of energy changes has been tried in the present series.