2%5 
Quantity of Carbon in carbonic Acid. 
Correction for Pressure, 
30:29,65: : 50,14 : 49,55- 
The quantity of oxygene at the mean was therefore 49,55 
cubic inches. 
100 : 53 : : 49,55 : 26,26. 
Consequently 26,26 cubic inches of carbonic acid gas were 
produced. 
100 : 47,26': : 26,26 : 12,41 grains. 
12,41 : 3,50 : : 100 : 28,20. 
Then, according to this experiment, 100 grains of carbonic 
acid gas contain 28,20 of coal. 
Calculation by Oxygene. 
100 : 33,82 : : 26,26 : 8,88 grains of oxygene consumed. 
3,50 coal 
12,38 
Calculation by carbonic acid 12,41 
by oxygene 12,38 
difference ,03 
Here, contrary to what happened in other experiments, the 
calculation by carbonic acid rather exceeds that by oxygene : 
12,38 : 3,50 : : 100 : 28,27. 
Calculating therefore by oxygene, 100 grains of carbonic acid 
contain 28,27 °f coal. 
Experiment with Plumbago . 
Thermometer 44 0 Fahrenheit, barometer 29,94. 
4 grains of plumbago, from a very fine specimen belonging 
to Dr. Babington, were put into the tray. Our oxygene left 
MDCCCVII. P p 
