62 
Mr. Faraday on two new compounds 
which had entered, being passed into the neck of the retort, 
stood at a certain mark 6 inches above the level of the mer- 
cury in the trough, occupying 1.25 cubic inches, and leaving 
24 cubic inches filled by the expanded muriatic acid gas and 
nitrogen. These volumes corrected to the pressure of 29.1 
inches, give 5.78 cubic inches for the chlorine absorbed, and 
19.47 cubic inches for the muriatic acid gas, &c. These ab- 
sorbed by water left 1.2 cubic inches of nitrogen ; so that the 
gases in the retort, after the action of solar light, were 
Muriatic acid gas - 18.27 cubic inches. 
Chlorine 
Nitrogen, &c. 
and before that action, 
Chlorine 
Olefiant gas 
Nitrogen 
Hence 23.47 cubic inches of chlorine had disappeared, and 
9.13 of these had entered into combination with an equal 
volume of 9.13 cubic inches of hydrogen liberated from the 
5 cubic inches of olefiant gas, to form muriatic acid ; and, 
consequently, 14.34 cubic inches of chlorine remained com- 
bined with the carbon of the 5 cubic inches of olefiant gas. 
Here, the volume of chlorine actually employed is not quite 
five times that of the olefiant gas, nor the volume of muriatic 
acid gas produced, equal to four times that of the olefiant gas ; 
but they approximate ; and when it is remembered that the 
conversion was not quite perfect, and that the gases used 
would inevitably contain a slight portion of impurity, the 
causes of the deficiency can easily be understood. 
In other experiments made in the same way, but with 
5 - 7 8 
1.2 
29.25 cubic inches. 
5 - 
1. 
