and on the Nature of the Diamond. 225 



100: 47-20 : : 29'13 : 13-76. 

 These 29-13 cubic inches of carbonic acid gas would there- 

 fore weigh 13-76 grains. 



The charcoal weighed 4 grains. 

 The residual white ash, 0-02 



Charcoal consumed 3-98 grains. 



Then, if 13-76 erains, the weight of the carbonic acid pro- 

 cured, contain 3^98 of charcoal, 1 GO grains must contain 28- 92. 



13-76 : 3-98 :: 100 : 28-92. 

 Then, according to this experiment, 100 grains of carbonic 

 acid gas contain 28-92 charcoal. 

 The gas before the experiment consisted of 

 Oxv^en 50-47 cubic inches. 

 Azote 1-56 



52-03 



After the experiment, 

 Carbonic acid 29-13 cubic inches. 

 Oxygen 21-34 



Azote - 1'56 



52-03 



Now as the volume of gas was miallered, it will be fair to 

 consider the quantity of oxygen gas consumed as equal to 

 the carbonic acid produced, or 29-13 cubic inches. 



Then, if 100 cubic inches of oxygen weigh 33.82 grains, 

 S9'13 cubic inches will weigh 9'85 grains. 



100 : 33-82 : : 29"13 : 9-85. 



The weight of oxygen consumed was therefore 9-85 grams. 



Charcoal consumed - - - 3-98 



Carbonic acid from this statement 13-83 grams. 



Do. by calculations on carbonic acid gas 13-76 



•07 

 Vol. 29. No. 115. Dec. 1807. P ^3-83 



