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Vanadium was determined by precipitation with cupf erron,® Fluoride was determined by thorium nitrate titration after separation by distillation.9 The original sample was fused with sodium hydroxide, treated with water, filtered, and the filtrate distilled.

16.0 = 10.0 cal./(mole °K.). This is well within experimental error of the 10.1 cal./(mole °K.) calcu-lated by Westrum and Payne and, as such, is further evidence for the proper choice of mechanism for the observed transitions.Acknowledgment. This work was performed under the auspices of the United States Atomic Energy Commission. The authors are indebted to Dr. Elfreda Chang for assistance in the evaluation of the data.

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