148 
MESSRS. W. R. BOUSFIELD AND C. ELSPETH BOUSFIELD 
or substituting the assumed value of .s F and deducting hes w from each side we get 
\fs — Es s —ne (s w —s c ) — C (h—n) eP. 
The values of n derived from the former paper are 
h = 9’10, 1479, 21-95, 
n = 378, 4-41, 5-10. 
From these values we get the interpolation formula, 
n = 0-042 + 0-4389/; — 0’009323/i 2 , 
whence the values of n required for the first three NaCl solutions are 
I. II. III. 
n = 3-348 4-254 5'052 
Using these values of n for these first three solutions with the corresponding known 
values of f and s w , taking E = 58"46 and e = 18*016, we have three simultaneous 
equations to determine the three unknown constants, and we thus obtain the values 
Es s = 142-09, s c = 3-404, C = 0’02. 
The value of Es s deduced in Section 19 depended on taking Ev 0 = 25'053 in order 
to calculate the values of xo- 
In the present section the value of Es s is deduced without reference to the value 
of En 0 . In Section 19 we obtained the value Es s = 142"25 giving s s = 2"433. The 
value now deduced gives s s = 142"09/58"46 = 2"431. So far then the present method 
of treatment gives consistent results. Using the above values of the constants we 
may proceed to calculate the values of n from the formula, 
Es s — ^eCP —f 
H ~ (sw-Sc-CP)e’ 
which is derived from the equation given above. 
In Table XVI. are set out the data for this calculation and the results. 
Table XVI.—Calculated values of n for NaCl Solutions at 20° C. 
No. of 
solution. 
h. 
CP. 
n. 
I. 
9-7347 
38-1 
0-5000 
3-35 
II. 
13-883 
17-3 
0-3789 
4-25 
III. 
20-758 
- 4-5 
0-2704 
5-05 
IV. 
29-189 
- 18-3 
0-2001 
5-36 
V. 
54-442 
-34-5 
0-1125 
5-58 
VI. 
109•94 
-51-6 
0-05734 
6-23 
VII. 
220-91 
-62-9 
0-02895 
6-71 
