WORK OF M. R. SCHMIDT. 



141 



is conceivable, however, that a mixture of glycerol with a very small percentage of 

 water or alcohol might give a slight minimum in fluidity, but the difficulty of deter- 

 mining this point would be very great. At the same time, a similar minimum in the 

 conductivity curves might make its appearance, and the parallelism of the two sets 

 of curves, which is one of the points to be established, would not be changed, even 

 if minima were found. At any rate, it is evident that in the case of mixtures of 

 glycerol with the other three solvents used we have to deal with mixtures of the 

 second class referred to above; that is, mixtures whose properties are not additive. 



Table 106. Conductivities of Lithium Bromide in Various Solvents at 25 and 85. 



COBALT CHLORIDE. 



The cobalt chloride was first crystallized from conductivity water, to free it from 

 traces of sulphates. The crystallization was continued until the mother-liquor no 

 longer clouded a barium chloride solution. The salt was then partially dehydrated 

 in a vacuum desiccator over sulphuric acid, after which it was pulverized and heated 

 in the air until it had assumed a lavender color. After being again pulverized, it 

 was placed in a hard-glass tube, and heated in a current of dry hydrochloric acid 

 gas for several hours at 250, during which it changed color to a pale pure blue. 



