ACKNOWLEDGMENT I thank E. Whalley f o r helpful discussions, and R. J.Farland, National Oceanographic Instrumentation Center, Washington, D. C., f o r sending me the observations of Carnvale and coworkers ( 2 ) .The thermal conductivities and viscosities of liquid biphenyl and the three terphenylt were measured over a range of temperatures using the hot-wire and capillary viscometer methods. These properties were also calculated as a function of temperature in the vapor phase to provide data for calculation of the performance of these compounds in heat transfer and other applications. Equations for the thermal conductivity of vapors at low pressure were formulated directly from a general equation fitted to the tabulated data of Bromley and Wilke. The viscosities of solutions of nine electrolytes-KCI, KI, KBr, KMnOd, LiCI, Lizso4, NaZC03, NaF, and MnSOd-in heavy water have been determined at 25', 35', 4 5 O , 60°, 75', and 90' C. a t various concentrations up to near saturation.