g8o Messrs. Allen and Pepys on the 
and kept so for ten minutes ; during this time the gas was 
repeatedly passed from one gasometer to the other; the tube 
did not become white hot, as in the experiment with charcoal, 
because in this case the combustion went on more slowly. 
When every thing was cooled to the temperature of the room, 
the gas was all passed into No. 1, by pressing down the receiver 
of No. 2, and the volume was precisely the same as when we 
began the experiment. On drawing out the tray, we observed 
that some of the diamonds were reduced to a minute speck, and 
all of them resembled opake white enamel : there was no 
discoloration in the tray, nor any residual ash whatever ; the 
unconsumed parts weighed 1,46 grains ; the original weight 
was 3,95 
1,46 
consequently 2,49 grains were consumed. 
We could not perceive any dullness on the surface of the 
mercury in the gasometers, or any appearance of moisture. 
On introducing lime water to 100 parts of the gas in the 
eudiometer, a dense white precipitate was formed, and 36 parts 
absorbed ; the test for oxygene absorbed 60, and a residuum 
of 4 was left. 
Correction for Temperature. 
6o° 480)49,84(0,103 49,84 
56 4 ,41 add for temp. 
4 difference. ,412 50,25 
Correction for Pressure. 
30 : 30,20 : : 50,25 : 50,58. 
The quantity of oxygene at the mean was 50,58 cubic inches. 
100 : 36 : : 50,58 : 18,20 cubic inches. 
