Duplicate cells with nearly pure acetic acid as the solvent could be reproduced to within 0.1 mv. and were constant in electromotive force for several months at least.A cell containing two solid phases in equilibrium with the saturated solution was prepared.The heat of formation of the compound Pb(C2H302)2O.5H20 was determined.

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A new method for the automatic measurement of the time of flow of a liquid in a viscometer of the Ostwald type by means of a photoelectric cell is described. The elimination of the psychological errors inherent in the older technique permits greater precision. Other sources of error in the use of the Ostwald viscometer are analyzed and the precautions necessary for precision viscometry are discussed.