Quantity of Carbon in carbonic Acid. 281 
The quantity of carbonic acid gas produced was 18,20 cubic 
inches. 
100 : 47,26 : : 18,20 : : 8,60 grains. 
8,60 : 2,49 : : too : 28,95. 
Then 100 grains of carbonic acid gas contain 28,95 of diamond. 
Calculation by Oxygene. 
100 : 33,82 : : 18,20 : 6,15 grains of oxygene consumed 
2,49 grains of diamond. 
8,64 
Calculation by carbonic acid 8,60 
,04 difference. 
8,64 : 2,49 : : 100 : 28,81. 
Thus if we calculate upon the oxygene consumed, 100 grains 
of carbonic acid gas contain 28,81 of diamond. 
Second Experiment on Diamond. 
Thermometer 48° Fahrenheit, barometer 30,08. Oxygene 
gas made as usual, left a residuum of 3 parts in 100. 
Eleven small diamonds, weighing 4,01 grains, were put into 
the tray. We began with 49,84 cubic inches of oxygene ; and 
every thing being properly adjusted, kept the platina tube red- 
hot for a quarter of an hour, and during this time the gas was 
passed from one gasometer to the other, as in the former ex- 
periments. When the tubes, &c. were cooled down to the 
temperature of the room, all the gas was transferred to gas- 
ometer No. 1. and the volume was exactly the same as before 
the experiment. On examining the tray, all the diamonds were 
entirely consumed and not a vestige left. 
