1614.] Co7istituenls of Azote. 265 



quantity of oxygen to that ascertained above. Now we have found 

 that there exists 0-1715 gr. azote in the acid gas of the precipitate. 



A O A O 



Hence if 100 : 55-6 :: 01715 : 09535 = oxygen in the azote, 

 being exactly equal to the weight of the oxygen in the oxide of 

 lead. 



The quantity of sulphur in the acid gas of the precipitate has 

 been shown to he 0*0953 ; and it has been deduced to exist in 

 combination with the lead in half the proportion to that of the 

 common sulplnnet. Now there exist 1*237 gr- °f lead in the pre- 

 cipitate ; and to convert this into a sulphuret would require 0*1907 

 gr. of sulphur. If we take half this quantity, 0*09535, we shall 

 have the exact proportion deduced to exist in the acid gas of the 

 precipitate. 



The hydrogen has been shown to exist in combination with the 

 oxygen of the acid gas in a double proportion to that existing in 



O H O H H 



water. Then as 1 : 0*133 :: 0*09535 :: 0*0126 x 2 = 0*0253 in 

 the acid gas of the precipitate. 



Exposition of the Arrangement of the Elements during the Changes 



under Consideration. 

 The mixed gas extracted from the flask had for its constituents 

 4*556 unknown gas + 0*437 hydrogen + 0*507 oxygen = 5*5 

 grains, originally occupying its capacity 37*704 cubic inches; and 

 5'7275 azote + 1*5225 oxygen = 7*25 atmospheric air = 12*75 

 grains, that now filled the same capacity. It therefore consists of 



WVi^hing Equal in volume to 



grains. cub. in. 



Unknown gas 4*556 16*259 



Hydrogen 0*437 19*618 



Oxygen 20295 6*026 



Azote 5*7275 19*375 



12*75 61*278 



There was a deposition of solid materials from these, calculated 

 to consist of 



f'mins. Cub. In. 



Sulphur 1*3417 



Azote 0*1598 0*546 



Oxygen 0*4302 0277 



Hydrogen . .0*0683 3*or;2 



10*75 gr. = 56*393 cubic inches 

 Condensed by their peculiar combination into the capacity of 

 37*704, "i about ISO volumes into 100, which will ba seen to 

 e with thai a certaiued by calculation, as described in the 

 ,.il table tliat will shortly follow. 

 Now the mixed gas is found to consist of 



