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The liquid-vapor equilibria of the helium-carbon dioxide system were studied in a vapor-recirculation apparatus. Six isotherms were studied, from 21 9.9' to 289.9' K., with pressures up to 200 atm. The accuracy is believed to be within about & 5 % of the reported values.

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tions. In each instance the static value at 35" fell a little above a straight line drawn between 30" and 40". This is consistent with a decrease in the latent heat with increasing temperature. Some of Cop 's 35" points fell Copp's values wrong, only that the static values are self consistent while not consistent with Copp's values. Both of the 35°C. total pressure curves were numerically integrated to obtain vapor compositions. The maximum difference in vapor composition occurs at 75 mole % amine in the liquid. At this point Copp's data yield an amine 'fraction of 0.865 in the vapor while the static data give 0.874. above the line and some below. T hp is does not prove ACKNOWLEDGMENT The support of this work by the Office of Saline Water, Department of the Interior, Washington, D. C., is gratefully acknowledged.

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