Quantity of Carbon in carbonic Acid. 289 
Lime water absorbed 41 parts from 100 
The tests for oxygene 55 
Residuum - - 4 or an increase of 2*. 
100 
Correction for Temperature. 
6o° 49,84 
£9 ,10 add for temp. 
1 diff. or 0,103 4 9>94i 
Correction for Pressure. 
30 : 29,45 . : 49,94 : 49,02. 
The quantity of oxygene at the mean would therefore be 
49,02 cubic inches. 
100 : 41 : : 49,02 : 20,09 
The carbonic acid gas produced was therefore 20,09 cubic 
inches. 
100 : 47,26 : : 20,09 : 9,49 
and this carbonic acid weighed 9,49 grains. 
Now the coal in the tray had lost 3,2 grains ; but as the 
whole of this was not carbon, but part of it volatile saline 
matter, &c. we shall endeavour to estimate the carbon by the 
experiment on plumbago. When 13,35 grains of carbonic acid 
contained 3,80 grains of carbon, 
13>35 --3>8o: :9,49:2,7c. 
The quantity of carbonic acid produced in this experiment, 
therefore, contained 2,70 grains of carbon; 
Loss 3,20 
Carbon 2,70 
Leaves ,50 for volatile saline matter, &c. 
So that this being granted, the present experiment agrees 
with the foregoing. 
