446 
Proceedings of the Royal Society of Edinburgh. [Sess. 
potassium ethyl di-propyl-malonate, 206 per cent, potassium carbonate, and 
6 7 ’8 per cent, water. 
The above investigations all were carried out at 25° C. To ascertain 
roughly the effect of temperature, a mixture was made up which just gave 
a homogeneous solution at the above temperature. This solution was then 
heated slowly in a water-bath. A slight opalescence occurred at 25°*4 C., 
indicating that the solution was separating into two layers. Another portion 
of the same mixture was cooled to zero, but there was no apparent change. 
Some of No. 2 mixture was put into a graduated tube and heated slowly 
in a water-bath, the volumes of the two layers being noted as follows : — 
Temperature °C. 
Vol. of Upper 
Layer (c.cs.). 
Vol. of Lower 
Layer (c.cs.). 
0*2 
1-90 
2-90 
16T 
1-91 
292 
253 
1-92 
2-94 
44-0 
193 
2-96 
66-0 
1*96 
2-98 
82*0 
1-97 
2-99 
In order to observe more accurately the effect of temperature, the 
following mixtures were made up and brought into equilibrium at three 
different temperatures : — 
No. of 
Mixture. 
Weight of 
KEt. salt (gms. ). 
Weight of 
K 2 C0 3 (gms.). 
Weight of 
Water (gms.). 
10 
6-063 
6-161 
10014 
11 
6-372 
6-265 
23-030 
12 
ob 
tained by dilut 
ion. 
The following results were obtained : — 
No. of 
Mixture. 
Temperature 
°C. 
Upper Layer. 
Lower Layer. 
Per Cent. 
KEt. Salt. 
Per Cent. 
k 2 co 3 . 
Per Cent. 
KEt. Salt. 
Per Cent. 
k 2 co 3 . 
2° 
25 0 
15-0 
5-1 
27-3 
10 
25 
31-0 
11-35 
2-6 
26-55 
56 
34-35 
11-25 
2-45 
28-35 
2 
62-9 
3-95 
0-55 
45-5 
11 
25 
65-9 
4-35 
0-45 
44-2 
56 
60-9 
3-65 
0-65 
47-2 
2 
47 2 
7-8 
0-7 
31-2 
12 
25 
48 6 
735 
0-4 
31-6 
56 
48-35 
7-45 
0-75 
33-0 
