ANALYSIS OF Il^.ON OR^S, &C. 43. 



from the pig and bar iron, leri him to conclude, that phos- 

 phorus is the chief cause of its fetid smell. 



VliF. Recapitulation and inferences.. 



From the experiiuents I have related, says Mr. VatKjae- General coa- 

 lin, itfoliows: elusions. 



1. That the five sorts of bog ore I anal3'3ed are composed 

 of the same principles, which are, beside iron, silex, alu- 

 miiie, lime, oxide of manganese, phosphoric acid, magne* 

 sia, and chromic acid. 



2 That the tive sorts of ore having been taken at a ven* 

 ture from places tolerably distant from each other, it is pro* 

 biible, that all ores of the same kind contain the same 

 substances-. 



3. Tiiat tiiese ores want only nickel, to contain the same 

 substances, as the stones that have fallen from the atmo* 

 sphere. 



4. Tiiat part of these subslances remains in the pig iron, 

 and probably in larger cjnaatity in cast iron, which may be 

 the caase of its greater hardness and brittleiiess. 



5. That the greater part of these substances is separated 

 during the reiiiiitig of the pig iron, when this operation is 

 well executed ; since they are found in the scorix, and in 

 the sublimed iron that udheres to the insides of the chim- 

 neys of the retiniug furnaces. 



6. That traces of them however are found in bar iton of 

 good quality ; and that probably chrome, phosphorus, and 

 manga iiese, are the chief causes, that rtnder iron hot short 

 or cold short. 



7. That the process of refining merits the greatest atten- The quality of 

 tion from iron-masters ; since it appears, that the good qua- on"ts refining 

 lity of iron depends 6a its skilful execution. 



8. That the presence of phosphorus and of chrome is to 

 be sought for not in the solutions of pig and bar iron alone, 

 b^it also in the residuums of their solutions, 



C). That by the union of hidrogen and carbon during the 

 dissolution of iron, and particularly of gray cast iron, an oil 

 is formed, which, in conjunction with a small quantity of 

 phosphorus, communicates a fetid smell to the hidrogen gas 

 Ihat dissolves theim 



10. That 



