3f,4 



Mr. G. F. Emery. 

 FIG. 3. 



[Apr. 



Solutions of 1 gram of cadmium bromide per 100 c.c. in 



alcohol and water gave the following results : 



Ethyl alcohol. 

 . 

 1-1 



10-0 



25-0 



50-0 



75-0 



100-0 



Water. 



100-0 

 98-9 

 90-0 

 75-0 

 50-0 

 25-0 

 



Sp.gr. 

 1-00992 

 1-00384 

 0-99464 

 0-97825 

 0-93992 

 0-88472 

 0-81106 



(fig. 4). 

 7-0 

 6-86 

 5-83 

 5-053 

 4-075 

 4-123 

 8-15 



These results show a marked difference from those for mixtures 

 the two alcohols, methyl and ethyl. In the latter case we have 

 inflected curve, which is never far from the mean line which it wot 

 occupy, if $ for the mixture were proportionally placed between 

 's for the pure liquids. In the present case, however, a very 

 admixture of either with the other causes a large drop in the value < 

 $, and the curve lies almost entirely below its lower extremity, 

 both cases the ends are as symmetrical as the positions of 

 extremities will permit. 



Now, the two pail's of solvents would appeal' to be good represent 

 tives of two classes of pairs of liquids. The two alcohols mix in 

 quiet way with no appearance of chemical action, or, if any, very lit 

 in the way of heat evolution and alteration of bulk, so that we migl 

 veiy well expect to find any property of the mixture not very dif 

 ferent from the corresponding properties of the two components, 

 lying somewhere between them in value. In the case of a mixture 

 alcohol with water we have, on the contrary, large evolution of he 



