The specific heat of liquid He /He mixtures has been measured at saturated vapor pressure for eight values of the He mole fraction~in the range 0. 53 «x «0.73 at temperatures from -0.6 tol. 4 K. For purposes of comparison, the specific heat of pure liquid He has also been measured under similar conditions. The measured specific heat, obtained with a calorimeter almost completely full of liquid, has been corrected to yield the specific heat of the liquid cJ. "at constant pressure and mole fraction. For the mixtures, the correction required was everywhere & 17&. To a resolution in temperature which varies from 0.1 to 3 m'K from one value of x to another, the specific heat at the A. peak appears to be finite, continuous, and cusped. Both the A. peak and the discontinuity in cJ, "as the system goes from the two-liquid-phase region to the one-liquid-phase region tend to disappear as the junction of phase boundaries is approached.
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