Cast Iron^ Steel, and Malleable Iron, 433 



Oxygen 0-137694 



Total araountof oxygen before the 2ncl ignition. 1'077244 

 Oxygen after 2nd ignition .'.... 0-028000 



Therefore we have 



Metallic iron 2-320400 



Silicon 0-152306 



2-472706 



Oxygen 1-077244 



Increase during ignition . 0-420000 

 Difference . 0*657244 



Powder before ignition weighed ^s1 ,„ 



already stated J 



Amount of bases 2-472706 



0-657294 

 The difference is to be ascribed to the volatilized carbon, 

 hydrogen and azote. 



If we compare this difference with the difference between 

 the real increase of the powder during ignition, and the cal- 

 culated oxygen, we find the 



Former difference . . 0-657294 

 Last difference . . . 65724 4 



0-000050 grains. 



This difference is so extremely small that we may con- 

 sider the oxygen only calculated as the real quantity taken up, 

 instead of 065729 carbon, hydrogen and azote. The increase 

 could therefore only be 0'420000, as the remaining quantity 

 of the absorbed oxygen =0-657244, was counterbalanced by 

 the 0-657294 burnt carbon, hydrogen and azote. 



The black residuum of the second part of the powder, which 

 as already stated weighed 3*39 grains, was equal to 0-75; the 

 loss therefore in 3-39 grains was = 2-64, consisting of iron 

 and oxide of iron. 



If we calculate from the hypothetically-assumed quantity of 

 carbon, hydrogen and azote in the first part of the powder, 

 the same relative quantity for the second part of the powder, 

 we ought then to have for 3*39 grains of residuum 0-71188 

 grains of carbon, hydrogen and azote. 



If we therefore assume the black residuum to contain only 

 silicon, and iron in its oxidized state, we obtain as already 

 mentioned, 



Silicon . . . . 0-1595 



Oxide of iron . . 0-3200 



0-4795 



