236 



ON THE QUANTITY OF CARBON IN CARBONIC ACID. 



After the experiment, 

 Carbonic acid '2$' 13 cubic inches. 



Oxig.n 21 '34 



Azote 1*56 



52'03 



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

 consider the quantity of oxigen gas consumed as equal to the 

 carbonic acid produced, or 29*13 cubic iiieh'cs. 

 Then, if 100 cubic inches of oxigen weigh 33'82 grains, 29*13 

 cubic inches will weigh 9<S5 grains. 



100: 33*82:: 29*13 :9'85. 

 77 charcoal. The weight of oxigen consumed was therefore Q'S5 grains. 

 Charcoal consumed 3'98 



100 parts of 

 carbonic acid 

 gas by weight 

 Contain 71-23 

 oxigen gas 



Carbonic acid from this statement 



Ditto by calculations on Carb. acidgas 1376 



13- S3 grains. 



•07 



Exp. 1. On 

 diamond . 



3*95 grs Brazil 



13*83 :3*9S: : 100:2877. 

 Thus, calculating by the oxigen consumed, 100 grains of car- 

 bonic acid gas contain 28*77 charcoal. 



First Experiment on Diamond, 

 Thermometer 5a? Fahrenheit, barometer 30*20. 

 Our oxigen was made as in the former experiment; it con- 

 tained no carbonic acid; and, on being tried with the impreg- 

 nated green sulphate, left a residuum of 3. parts in 100. 

 Having selected nine of the clearest and. most transparent 



diamond bum- Brazil diamonds, we found they weighed 3'9o grains. Theso 

 real. " wCre r ^ n S e ^ m ^ ne Patina tray, which was placed in the tube, 



and the whole apparatus, adjusted as before, was perfectly air- 

 tight. The quantity of oxigen was 4-9*84 cubic inches, as in 

 the last experiment. The .same precaution.^ were used to se- 

 cure accuracy in the results as in the former experiment; and 

 it would only be an unnecessary intrusion on the time of the 

 Society to repeat them. The platinatubc was heated red hot, 

 and kept so for ten minutes : during this time the gas .was re- 

 peatedly 



