it is not surprising that they respond similarly toward salt solutions. It appears that secondary amines may be slightly superior to the tertiary amines.Table II and Figure 5 show the results of a study which confirms the validity of the expression K = {K+ K .)12.Gradient quantities of adipic and oleic acid were added to diisopropylamine and equilibrated with 0.1% salt solution.These acids add foreign ions to the system and increase considerably the supply of amine ions.The adipic acid, being water-soluble, increases the supply of anions in the water phase, raising the sodium selectivity. The water content of the amine phase is reduced, probably through increase in the electrolyte content of the water phase. Oleic acid suppresses the sodium selectivity. The water content of the amine is increased, probably through solvation with the oleate ions. Although the individual ionic selectivities were affected radically, the mean selectivity was unaffected, except by the variation in water content. The results obtained with these acids agree with the other secondary amine data. ACKNOWLEDGMENTThe support of this work by the Office of Saline Water, Department of the Interior, Washington, D. C., is gratefully acknowledged.

Equilibrium vaporization rates of solid and liquid NaCl, KC1, KBr, Csl, and LiF have been measured, using Knudsen cells, with orifice flows in the molecular, hydrodynamic, and transitional regions. Observed rates in the latter two regions are always greater than those predicted by the Hertz-Knudsen theory for molecular flow. Methods for calculating equilibrium vapor pressures from rates in the transitional and hydrodynamic regions have been developed, and vapor pressures calculated in this way agree well with those derived from standard thermodynamic procedures. The ratio, actual flow/(hypothetical) Knudsen flow, in the transition regime depends only on the mean free path and is independent of the diameter of the orifice.

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