Dr. Thomson on Oxalic Acid . 
79 
gas itself must have furnished a quantity of oxygen, equiva- 
lent to the bulk of two cubic inches, besides all the carbon 
contained in 93 inches of carbonic acid. 
This carbon amounts in weight to 12.09 grains. 
Two cubic inches of oxygen weigh .68 
Total 12.77 
But as 100 cubic inches of the gas weigh 28.15 grains, it is 
obvious that besides the 12.77 grains which it furnished to the 
carbonic acid, it must have contained 15.38 grains of addi- 
tional matter ; but as the only two products were carbonic 
acid and water, it is plain that the whole of this additional 
matter must, by the explosion, have been converted into water. 
Its constituents of course must have been 
i3-!9 oxygen 
2.19 hydrogen 
15.38 
Adding this to the 12.77 grains formerly obtained, we get the 
composition of the gas as follows : 
Oxygen 1 3.87 
Carbon 12.09 
Hydrogen 2.19 
28.15 
which reduced to 100 parts, becomes 
Oxygen 49.27 
Carbon 42.95 
Hydrogen 7.78 
100.00 
