This paper is a continuation of recent work by H. L. Bronson, H. M. Chisholm, and the author (3) on the specific heats of tungsten, molybdenum, and copper from 0° to 500 °C. The "method of electrical heating" and adiabatic calorimetry have been extended to determine the specific heat of copper from −78° to 0 °C.The equation previously given for the specific heat of copper contained only the first two terms of the Debye expansion and was found not to hold below −30 °C. The following equation containing four terms of the Debye expansion fits the experimental curve from −78° to 500 °C. with a maximum deviation of only about 0.05%,[Formula: see text]where the units are joules per gram per °K. The constants of this equation were determined empirically and their close relation to theoretically expected values has been discussed.