EADIATION OF HEAT BY GASES AND VAPOUES. 
19 
By mercurial gauge. 
Tension. 
Deflection. 
Absorption. 
^ inch 
56-3 
94 
1 inch 
58-2 
120 
Table IX. — Iodide of Methyl. 
Unit-measure iVlh of ^ cubic inch. 
Absorption. 
y- 
Measures. 
r 
Observed. 
Calculated. 
1 
3-5 
3-4 
2 
7-0 
6-8 
3 
10-3 
10-2 
4 
15-0 
13-6 
5 
17-6 
17-0 
6 
20-5 
20*4 
7 
24-0 
23-8 
8 
26-3 
27-2 
9 
30-0 
30-6 
10 
32-3 
34-0 
By mercurial gauge. 
• 
Tension. 
Deflection. 
Absorption. 
inch 
48-5 
60 
1 inch 
56-5 
96 
Table X. — Iodide of Amyl. 
Unit measure i^th of a cubic inch. 
Absorption. 
A 
Measures. 
Observed. 
Calculated. 
1 
0-6 
0-57 
2 
1-0 
1-1 
3 
1-4 
1-7 
4 
2-0 
2-3 
5 
3-0 
2-9 
6 
3-8 
3-4 
7 
4-5 
4-0 
8 
5-0 
4-6 
9 
5-0 
51 
10 
5-8 
5-7 
The deflections here are very small ; tlie substance, however, possesses so feeble a 
volatility, that the tension of a measure of its vapour, when cliflused through the expe- 
rimental tube, must be infinitesimal. With the specimen which I examined, it was not 
practicable to obtain a tension sufficient to depress the mercury gauge ^ an inch; 
hence no observations of this kind are recorded. 
D 2 
