Acknowledgment.-The author wishes to ex- press his thanks to Dr. Nicholas S. Yanick, for- merly of this Department, for his help in some of the experimental work of this paper. Summary Solubility measurements are given for the sys- tems KI-K2S04-H20 (at 25') and NaI-Na2S04- H20 (at 15, 25 and 45'); these salt pairs form neither double salts nor solid solutions at the tem- peratures reported. NEW YORK, NY RECEIVED APRIL 21, 1936 ... [CONTRIBUTION FROM THE ...