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Proceedings of the Royal Society of Edinburgh. [Sess. 
upper layer. On the other hand, the amount of potassium ethyl di-propyl- 
malonate in the potassium carbonate layer is scarcely appreciable in the 
first six mixtures, and it is only when the solutions are comparatively dilute 
that there is any appreciable increase in the amount of the ester salt in the 
lower layer. This confirms the results of the rough experiment previously 
referred to, viz. that in order to produce equilibrium when a mixture is 
Fig. 2. 
diluted, some potassium carbonate passes from the lower to the upper layer. 
It will also be observed that the percentage of water in the lower layer at 
first increases and then diminishes as the mixtures become more dilute. 
The results shown in the above table may be represented graphically. 
By plotting the percentage of potassium ethyl di-propyl-malonate against 
that of potassium carbonate in each layer in the series 1 to 7, two curves 
(fig. 1) are obtained representing the upper and lower layers respectively. 
