250 On the Component Parts of Iron-JIones, 



period of de-oxygenation. In no other ftate either raw CM 



roafted does iron-ftone poffefs this property, unlefs highly 



united to lime; but remains unditlolved till it has attracted 



a portion of the oxygen from the acid with which it is in 



contacl. 



From thefe confirming circumftances T conclude, that the 

 particles of metal exift in a highly difengaged ftate ; that 

 they are partially malleable, vet fo much combined with 

 oxygen as to be eafily precipitated, in fuiion, for the pro- 

 duction of caft-iron, with a fparing proportion of fuel, and a 

 proper application of folvcnts. So far, therefore, as this ex- 

 periment leads us, the practical analyfis of this ore may be 

 thus fiated : 



In the afiay-furnace this iron-ftone yielded a button of 

 fuper-carbonated crude iron equal to - 39/5 parts. 



Water, carbonic acid, and fulphur, loft in fim- 

 ple diftillation - 336 



Oxygen taken up by the charcoal - 9*0 



In the fubfeque nt part of the operation 

 I found that, when the iron-ftone had af- 

 fumcsJ malleability, and brightened under 

 the file, a further quantity of oxygen was 

 taken up, equal to - 4*2 — iy% 



Clay, lime and filex united in the (tone - iy7 



100 parts. 

 The earths I found to be proportioned nearly as follows : 

 Clay 7 parts, calcareous earth 4, filex vj = 13*7. 



II. Of a calcareous iron-ftone, reduced in the fame man- 

 ner, I operated upon - - - 1 750 grs. 



After being expofed to a fimilar diftillation, 

 I found it to weigh - 1090 



Loft in water, acid, and fulphur, equal to 37*7 

 per cent. _____ 660 grs. 



This iron-ftone, when torrefied, exhibited a thin fchiftus 



of 



