176 THOMPSON YATES AND JOHNSTON LABORATORIES REPORT 
chloroform. Half-a-cubic centimetre was introduced into each tube of the densi- 
meter of the chloroform water on the one side and of the same distilled water 
without chloroform on the other. The temperature at which the experiment was 
carried out was 17° C, and the volume at which readings of pressure were taken 
varied from 2 to 50 c.c. The percentage of chloroform in the water was not known 
directly, but was calculated by extrapolation of the curve showing V.P., see Curve I, 
Fig- 3- 
The following table gives the results of the experiment, which are also shown 
graphically in Curve I, Fig. 3, in which the abscissae show pressures of chloroform 
vapour and the ordinates the product of the volume and pressure of vapour. In 
Curve I, Fig. 4, the same experiment is shown with pressures of chloroform vapour 
as abscissae, and percentage of chloroform dissolved at each pressure as ordinates : — 
Experiment I. — Distilled Water 
Temperature 17° C. 
vapour space 
Pressure of 
chloroform in 
vapour space 
in mm. of 
Percentage by 
chloroform in 
vapour sp;ice 
Weight in 
grammes 
of chloroform 
in vapour 
space 
Weight in 
grammes 
of chloroform 
in solvent 
Percentage by 
weight of 
chloroform in 
Coefficient of 
distribution 
between 
vapour space 
2 
74-61 
0-04957 
0-00099 
0-00293 
0-586 
I : 1 1-8 
3 
6o - 62 
0-04027 
O-OOI 2 I 
0-0027 1 
0-542 
1 : 13-4 
5 
51-29 
0-03408 
0-OOI70 
0-00222 
0-444 
I : 13-0 
c 
0 
47-69 
0-03168 
o*oo 1 90 
0"00202 
0-404 
7 
43-08 
0-02862 
0-00197 
0'OOI95 
0-390 
, : 13-6 
8 
38-91 
0-02585 
0-00207 
0-OOI85 
0-370 
1 : 14-3 
9 
35-98 
0"02 39O 
0-002 I 5 
o-ooi 77 
°-354 
1 : 14-8 
10 
3+-36 
0-02283 
O-0O228 
0-00164 
0-328 
1 : 14-4 
1 2 
28-83 
0-01915 
0-002 30 
0-00l62 
0-324 
1 : .6-9 
1 5 
26-16 
0-01738 
0-00263 
o-ooi 29 
0-258 
1 : 14-8 
20 
22-62 
o-oi 503 
0-0030I 
0-0009I 
0-182 
1 : 12-1 
2 5 
I7-65 
0-01173 
O-O0293 
0-00099 
0-198 
1 : ,69 
30 
15-84 
0-01052 
0-003 1 6 
0-00076 
0-152 
1 : 145 
35 
I4-37 
0-00954 
0-00334 
0-00058 
o-i 16 
1 : 122 
40 
I2 "43 
0-00835 
0-00334 
0-00058 
o- 1 1 6 
I : 13-9 
+5 
11-87 
000787 
0-003 54 
0-00038 
0-076 
1 : 9-7 
5° 
10-54 
0-00700 
0-00350 
0-00042 
0-084 
I : 12-0 
