GASEOUS AND LIQUID STATES UNDER VARIOUS CONDITIONS. 
51 
Table IV.—Compressibility of 3 v. C0 3 and 4 v. N. at 48°'4. 
p 
t 
€ 
t' 
9 
41-90 
o 
8-39 
1 
4 4'6 6 
o 
48-22 
0-02635 
48-80 
8-42 
1 
5 2 5 9 
48-11 
0-02239 
55-86 
12-06 
1 
6 110 
48-48 
0-01929 
64-18 
12-08 
1 
7 0*9 2 
48-43 
0-01662 
72-54 
12-18 
1 
8 1*56 
48-66 
0-01448 
110-50 
12-36 
1 
13 1*4 
48-38 
0-00896 
147-10 
12-36 
1 
1 8 2*3 
48-49 
0-00646 
223-60 
12-40 
1 
2 7 6*5 
48-47 
0-00430 
No liquid carbonic acid was formed in any of these experiments, although the 
experiments in the first series were made at a temperature 29° below the critical 
point of pure carbonic acid. The results of the foregoing experiments are represented 
graphically in the following figure, in which the curves for the different temperatures 
present a remarkable similarity of form, giving no clear indications of a difference of 
character for temperatures above and below 31°. 
Eig. 1. 
If we assume Dalton’s law to be true, and Boyle’s law to be true in the case of 
nitrogen for the pressures employed, the following curves will represent the changes 
of volume of the carbonic acid in the mixture at the indicated pressures and 
temperatures. [See fig. 2, which is taken from a provisional figure in the MS.] 
I have endeavoured to ascertain approximately the form of the carbonic acid curve 
in this mixture, assuming as sufficiently accurate for my purpose that nitrogen in 
contracting obeys the law of Boyle ; but the curves so obtained, although they give 
indications of a fall to the liquid volume at the two lower temperatures, are wholly 
h 2 
