Comparative measurements of the vapor pressures of ordinary water and deuterium water were undertaken in this extended range because similar comparative measurements were contemplated on the vapor pressures of saturated solutions and on the dissociation pressures of salt hydrates containing these two varieties of water.The Material Used.-The deuterium water was prepared in this Laboratory in the manner previously reported.1 After electrolysis the residue, which contained NaOD, was distilled three times as follows: first, after passing carbon dioxide in excess; second, after adding barium oxide to precipitate carbonate; and third, without addition of any reagent. This yielded a product of d2S25 1.1079 as compared with 1.1074 as reported by others.2 Each of the two experimental runs, A and B, utilized a different sample of deuterium water.

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