IPI ON THE QUANTITY Otf CARBON IN CARBONIC ACID. 



milky appearance. The tube was rendered white hot by the 

 combustion of the carbonaceous matter in oxigen. The fire 

 was kept up about S minutes, and the gas passed several 

 times. When all was cool, we could observe no alteration 

 in the volume of gas by the register. The tray contained a 

 mixture of salts; and being weighed, was lighter by 3*2 

 Residuum 8 grains. This loss was not wholly carbon, for it is well known 

 if 18 ' that animal substance contains a variety of salts, as phos- 



phates, muriates, &c. some of which, though not volatile in 

 a low red heat, might be decomposed and dissipated in the 

 intense white heat produced by the combustion of the car- 



Siight efflores- k Qnaceoug matter in oxigen ; and we accordingly found the 

 cence on the . n . 



interior of the internal parts of the gasometers and tubes very slightly co- 

 apparatus, vered with a soFt of efflorescence. On examining the gas 

 after the experiment, 



Lime water absorbed 41 parts from 100 

 The tests for oxigen 55 

 Residual <*as Residuum .• • 4 or an increase of 2. 



increased '02. 



100 



Correction for temperature. 

 6d° 49*84 



59 -10 add for temp. 



1 diff, or 0*103 49*94 



Correction for pressure; 

 30 : 29*45 : : 49D4 : 49*02. 



The quantity of oxigen at the mean would therefore b« 

 49*02 cubic inches. 



100 : 41 : : 49*02 : 20*09 



Carbonic acid The carbonic acid gas produced was therefore 20*09 cubic 



^produced mches> 

 20 G9£ub in. 



100 :47*2G:: 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, 



