EADIATION OF HEAT BY GASES AND VAPOUES. 
15 
Table V. — Sulphuric Ether. 
Unit-measure i^th of a cubic inch. 
Absorption. 

asures. 
r 
Observed. 
Calculated. 
1 
5-0 
4*6 
2 
10-3 
9-2 
4 
19-2 
18-4 
5 
24-5 
23-0 
6 
29-5 
27-0 
7 
34-5 
32-2 
8 
38-0 
36-8 
9 
44-0 
41-4 
10 
46-2 
46-2 
11 
50-0 
50-6 
12 
52-8 
55-2 
13 
55-0 
59-8 
14 
57-2 
* 
64-4 
15 
59-4 
69-0 
16 
62-5 
73-6 
17 
65-5 
77-2 
18 
68-0 
83-0 
19 
70-0 
87-4 
20 
72-0 
92-0 
21 
73-0 
96-7 
22 
73-0 
1012 
23 
73-0 
105-8 
24 
77-0 
110-4 
25 
78-0 
115-0 
26 
78-0 
119-6 
27 
80-0 
124-2 
28 
80-5 
128-8 
29 
81-0 
133-4 
30 
81-0 
138-0 
We here find that the proportion between density and absorption holds sensibly good 
for the first eleven measures, after which the deviation gradually augments. 
I have examined some specimens of ether which acted still more energetically on the 
thermal rays than those above recorded. No doubt for smaller measures than of 
a cubic inch the above law holds still more rigidly true ; and in a suitable locality it 
would be easy to determine with perfect accuracy i^th of the absorption produced by 
the first measure ; this would con-espond to T^oof^ of ^ cubic inch of vapour. But on 
