224* 0K T1IE QUANTITY OF CARBON IN CARBONIC ACID. 



had passed info gasometer No. 2, the gas was let out by 

 opening the cock at the top of its glass receiver, and pres- 

 sing it down ; the cock being then closed, the gasometer 

 No. 2 was completely empty, and the whole of the gas from 

 No. 1 was driven through the tubes into No. 2, and back 

 again. The common air having been previously withdrawn 

 from the small receiver R, we tried the purity of our oxigen 

 by the eudiometer in the manner before described, and 

 found a residuum of 3 parts in 100: we then disengaged as 

 much gas as reduced the quantity to 47 cubic inches by the 

 register or scale; to this must be added the contents of the 

 tubes and sockets 2*84 cubic inches, making the total quan- 

 tity of oxigen employed 49*84 cubic inches. 



Correction for temperature. 

 49*84 480)49'84(0'103 60° 



1*85 for temp. 18 42 



5 1 69 1 *854 add for temp. 1 8 diff. 



Correction for pressure. 

 30: 30-2:: 51-69 :5203. 



The volume, therefore, at mean pressure and temperature, 



would have been 52*03 rubic inches. 



Burned in the We now lighted a fire in the small black lead furnace 



witrTox^een un ^ er tne platina tube, and, as soon as it became red hot, 



gas. opened the cocks, and passed the gas from No. 1 to No. 2, 



when the charcoal entered into vivid combustion, and heated 



the platina tube white hot. The operation was repeated 



many times during 6 or 7 minutes, by pressing alternately 



No flash of upon the glasses of the gasometers; Not the least flash of 



light or appear- light was observable in the glass connecting tubes GG, nor 



anceof BOB- ' ° »'■■>* r™ r 1 • 



ture. the smallest appearance 01 moisture. 1 he turnace being 



removed, the tube was now cooled by the application of wet 

 cloths ; and when all was reduced to the temperature of the 

 room, we pressed upon the glass of gasometer No. 2, so as 

 to force ail the gas into No. 1 . The cock below being closed, 

 we tried the tubes, &c. and found them perfectly air-tight. 

 We next unscrewed the tube and took out the platina tray ; 

 but it only contained a light white ash, somewhat resembling 



the 



