1814.] Constituents of Azote. 263 



and dried, weighed 1*72 grain. Now the mixed gas has been 

 elsewhere shown to contain 4S - 7 per cent, in volume of acid gas. 

 Hence if 100 : 48*7 :: 2-25 : 1*09575 = volume of acid gas com- 

 bined with the oxide of lead : — 100 cubic inches of acid gas have 

 also been shown to weigh '55*38 grains. Hence if 100 : 35*38 :: 

 1*09575 : 0-3876 = weight of acid gas combined with the oxide of 

 lead— and 1*72 — 0*3S76 = 1*3323 = weight of the oxide of lead 

 combined with the acid gas. The precipitate, then, consists of 



Yellow oxide of lead 1*3323 



Acid gas 6-38/6 



1*72 



We may hence calculate the weight of an atom of acid gas to 

 be as — 



Calculation of the Coynposition of the Acid Gas from the Weight of 



its Atom. 



We have elsewhere deduced the symbol of an atom of acid gas to 



2 8 4 



be S O A H : the weight of its atom must therefore be 2 + 2 + 

 3*599 + 0-533 = 8*133. This will be found to agree wonderfully 

 with that deduced from its combination with the oxide of lead, 

 7*959, the numbers being as near as the nature of the experiments 

 could lead us to expect. We may therefore proceed to determine 

 the proportions of the constituents of the acid gas. 



8-133 : 2 :: 100 : 24-6 Sulphur. 



8*133 : 2 :: 100 : 24*6 Oxygen. 



8-133 : 3*599 :: 100 : 41*255 Azote. 



8-133 : 0*533 :: 100 : 6*545 Hydrogen. 



8-133 100 



Cumulation of the Constituents of the Acid Gas from Experiment. 



We will attempt to deduce the composition of the acid gas from 

 Its combination with the oxide of lead. It is most probable that an 

 atom of acid gas is combined with an atom of oxide of lead. We 

 may hence proceed 1 



/ 'or Sulphur. — The lead must therefore be combined with 



Milpliur in the precipitate in half the proportion to that in which it 



rxists in the common sulpliurot. Now the yellow oxide is coui- 



'1 of UK) had and 7*71 oxygen; the snlphiirct, of LOO lead 



tad 15*42 lulphur. Then as 107-71 : 100:: 1*3323 : 1-237 = 



15 -V J 

 quantity of lead in the precipitate — and as 100 : ■ -■ :: 1*257 : 



0*0953 = cpmntity of sulphur in the precipitate. 



