ON THE SPECIFIC HEAT OF AQUEOUS SOLUTIONS. 
133 
In Table VIII. are set out the values of the contraction function x which are 
calculated from the densities by means of either of the expressions 
x = (E + he) (w-v), 
or 
X = 100E (w—v)/ P, 
where 
E = weight of a gramme molecule of the solute, 
e = weight of a gramme molecule of water, 
v = 11p = the specific volume of the solution, 
w — the specific volume of pure water. 
The values of E are taken as 74‘56 for KOI and 58'46 for NaCl. 
The properties of the contraction function x are explained in a former paper 
(Bousfield, ‘Trans. Chem. Soc.,’ vol. 107, 1408, 1915) and will be referred to later. 
Table VIII.—Values of x . 
No. of 
solution. 
h. 
X7- 
X20- 
X33- 
KC1. 
I. 
16-362 
45-12 
44 ■ 38 
44-09 
II. 
23-785 
45-91 
45-03 
44-67 
III. 
35•296 
46-71 
45 • 70 
45-27 
IV. 
53-743 
47 • 37 
46 • 23 
45-73 
■V. 
108-72 
48-11 
46-83 
46-28 
VI. 
218-30 
48-53 
47-21 
46-57 
cc 
48-9 
47-75 
47-00 
NaCl. 
I. 
9-7347 
38-24 
37-55 
37-22 
II. 
13-883 
39-17 
38-33 
37-92 
III. 
20-758 
40-19 
39 17 
38-64 
IV. 
29-189 
40-90 
39-74 
39-15 
V. 
54-442 
41-80 
40 • 44 
39 • 72 
VI. 
109-94 
42-66 
41-11 
40-31 
VII. 
220-91 
43 17 
41-51 
40-79 
cc 
44 • 06 
42 • 23 
41-44 
14. Final Specific Heat Values. —On each interval of 13° C. there is a possible 
error of about 1 per 1000 on the thermometric reading of the interval and also of 
about 1 per 1000 on the reading of the watt balance. A glance at Table X. 
will show that the actual differences of calculated values from the observed mean 
values in that series are such as would result from casual adverse combinations of the 
