AZOTIC GAS. 119 



cult to prevent it from being contaminated, when 

 the gas is prepared over water. 



Berzelius and Dulong, in their paper on the 

 Specific Gravity of Gases, state its specific grav- 

 ity to be only 1-0010. But^this statement can- 

 not be accurate ; for it is inconsistent with the 

 specific gravities of oxygen and azotic gases, 

 which they themselves have given. According 

 to them, the specific gravity of 



Oxygen gas = 1 1 026 

 Azotic gas = 0-9760 



2 ) 2-0786 



1-0393 = sp. gr. of deutoxide of azote, de- 

 duced from these data. 



These gentleman have rated the specific gra- 

 vity of deutoxide of azote a great deal too 

 low. 



If 1 volume of protoxide qf azote, and half a 

 volume of oxygen gas, were to unite and be re- 

 duced to fth of a volume, we should obtain a 

 compound, having the constituents and specific 

 gravity of deutoxide of azote. For 



Sp. gr. of protoxide of azote = 1-5277 

 sp. gr. of oxygen gas =0-5555 



2 ) 2-0833 



1-04-16= sp. gr. of deutox- 

 ide of azote. 

 H 4 



