433 
Cast Iron^ Steely and Malleable Iron, 
Oxygen 0*137694 
Total amountof oxygen before the 2nd 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 
I)ifFerence . 0*657244 
Powder before ignition weighed 
already stated . 
Amount of bases 
3*130000 
2*472706 
0*657294 
The difference is to be ascribed to the volatilized carbon, 
hydrogen and azole. 
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 . . . 0 657244 
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 0- 65729 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 
