447 
1909-10.] Equilibrium in a Ternary System. 
The diagram fig. 3 represents the above results. When the mixture is 
such that the upper layer contains about 48 per cent, of potassium ethyl 
di-propyl-malonate, the three iso-thermals are very close together, and 
hence at this concentration it is evident that the effect of temperature on 
the mixture is very small. 
An attempt was made to find out the temperature at which the two 
solid phases and the two liquid phases were present at the same time, but 
owing to the extreme viscosity of the liquid this was not successful, though 
it was found to be probably in the vicinity of 46° C. 
A sample of sodium ethyl di-propyl-malonate was also made, and its 
solutions were found to have the same properties with regard to a solution 
of sodium or potassium carbonate as the potassium ethyl salt had to either 
of these solutions. 
Chemistry Department, 
University of Edinburgh. 
( Issued separately July 14, 1910.) 
