136 



HEATING. 



Or they may be represented thus : 

 Carburetted Hydrogen. 



The above 



Gas , I its constituents, 



Bi-carburetted Hydrogen. 



its constituents, 



Although not intending to take any further notice, in this 

 place, of the bi-carburetted hydrogen, I have, however, annexed 

 the above diagrams, representing this gas and its constituents, 

 that both may be under view at the same time ; and by which it 

 will be seen, that although, in volume, the two gases are precisely 

 the same, there is yet double the quantity of carbon in the bi-car- 

 buretted that there is in the carburetted hydrogen : this circum- 

 stance is of great importance, and must be kept in our recollec- 

 tion, as these proportions will be found to have a considerable 

 influence during the subsequent process of its combustion. ^ 



* The mode of representing the volumes of gas, by rectangular figures, 

 as adopted by Mr. Brande and other chemists, is favorable, so far as 

 tingle atoms are concerned, inasmuch as the eye at once recognizes the 



