502 TRANSACTIONS OF THE AMERICAN INSTITUTE. 



The composition of the condensed smoke was almost identi- 

 cally the same, being : 



Sulphate of potassa 65.29 



Carbonate of potassa 23.48 



Hypo-sulphite of potassa _ 4.90 



Potassa 1.33 



Sulplio-cyanide of potassium 55 



Saltpetre 2.48 



Carbon 1.86 



Carbonate of ammonia .11 



100.00 



The composition of the gas is altogether different from what 

 we formerly supposed it to be. Carbonic acid and nitrogen form 

 nearly the whole. It was found to be : 



Carbonic acid _ _ 52.67 



Nitrogen 41.12 



Carbonic oxide 3.88 



Hydrogen - 1.21 



Sulpliuretted hydrogen 60 



Oxygen 52 



100.00 



The pressure of the gasses is 4,374 atmospheres, of which 

 1,000 is due to expansion by heat. The solid products of the 

 combustion of 100 lbs. of powder amounted to 67.70 per cent., 

 and the gaseous products to 31.24 per cent., the results being : 



Sulphate of potassa 42.20 



Carbonate of potassa. 12.60 



Hypo-sulphite of potassa ._ 3.20 



Sulphide of potassium 2.10 



Siilpho-cyanide of potassium _ 30 



Nitrate of potassa 3.70 



Charcoal _ 70 



Sulphur _ -.. .10 



Carbonate of Ammonia 2.80 



Nitrogen.. 9.00 



Carbonic acid 20.10 



Carbonic oxide 90 



Hydrogen _ 02 



Sulphuretted hydrogen _ — .18 



Oxygen _ .14 



98.94 



