2801ment is quite satisfactory. Similar data for solutions up to 0.1 M have been discussed by Scatchard.28The writer wishes to express his indebtedness and gratitude to the Elizabeth Thompson Science Fund for providing mechanical aid in the calculations. SummaryA report is made of the determination of the freezing points of aqueous solutions of hydrochloric acid up to a concentration of 1.0 molal, making use of a platinum thermometer as a temperature measuring device.The activity coefficients are calculated and compared with those derived from electromotive force measurements.