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Jones1 has pointed out the foSlowing general relations dedzlced from the study of a large number of data concerning temperature coefficients: I. Those ions with the largest hydrating power have the largest temperature coefficients of conductivity. 2. Those substances having equal hydrating power have approximately the same temperature coefficients of conductivity. 3. At higher dilutions the temperature coefficients of conductivity, for any given substance, are greater than at lower dilutions. In the present investigation all of these relations have been found to hold, with the few apparent exceptions which are noted in the above discussion. SWlllary. Eighteen more or less unusual salts were studied with reference to the conductivity, over a range of temperature from oo to 35O, and, wherever possible, their dissociation has been calculated. Their temperature coefficients were also calculated in two sets of units. The results of this investigation are, for the most part, in accord with the findings of other workers in this field in this laboratory. Three exceptions to the rule that dissociation decreases with increased temperature were found. Two apparent exceptions to the rule that large temperature coefficients are indicative of great hydration were noted, and possible explanations offered. BALTtYOSta, MD. ~COXTSUEUTIOh' FROM THE CHEMISTRY DEPARTM&NT OF JOHNS HOPKINS UNIVERSITY. ] THE VtSCOSITEES OF SOLUTIONS OF CAESIWM SALTS IN MJ[IX;ED SOLVERTSe BY P. B. DAVIS AHD H a n u C. Jolrsa.