VOLUME 2 2, NO. 6, JUNE 1950 793 -1.12 volts vs. the saturated calomel electrode was observed, instead of -1.01 volts, is evidence of some kind of complexing, not all of which can be explained by ammonia complexing. This may indicate that the acetate ion also has a tendency to form complexes with the zinc.The previous investigators (1,2) state that their methods for indium can tolerate no chloride ion, whereas in the procedure used in this investigation the chloride ion is present to the extent of 0.1 molar. This fact may explain the different precipitate composition obtained, for it is well known that indium chloride is highly complexed and under these conditions the authors have found the normal indium ferrocyanide to precipitate.The conclusion that might be drawn from this situation is that the presence of complex ions, in both of these cases, must account in some way for the precipitation of normal ferrocyanides rather than the potassium double salts, although potassium ions are added during the titrations.