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solubilities of the phosphate and the arsenate are of the same order of magnitude. The ratio of the solubilities of both salts reported by Wenger, however, fluctuated in an irregular way, with the composition of the medium. SUMMARY
The distribution coefficient
has been determined a t 2 5 T . Over a range of mole per cents of 1 to 60 of arsenate in the solid phase, D was found constant and equal to 5.65 d= 0.2. REFERENCES
(1) KOLTHOFF, I. M., AND CARR,C. W . : Ind. Eng. Chem., Anal. Ed., in press. (2) MGLLOR, J. W. : A Comprehensive Treatise o n Inorganic and Theoretical Chemistry, Val. IV, p . 884; Vol. IX, p. 177. Longmans, Green and Co., London (1923). (3) WENOER,P.: Thesis, Geneva, 1911.
THE DECOMPOSITIOX OF ETHYLENE AXD CARBOX MONOXIDE OK METALLIC CATALYSTS AUBREY R . McI
