On the Component Tarts of Iron-jlones . 251 



of calcareous plates : its fracture alfo prefented calcareous 

 lines running in various directions : its colour was reddifh 

 brown, partially fibrated, magnetic, and tenacious to the 

 tongue. 



I took of the fame, mixed with charcoal duft, 1750 grs. 

 and expofed the vefTel to a temperature equally 

 high with the former. 



The refidue, when carefully feparated from the 

 charcoal, warned and dried, weighed - - 922 



828 grs. 



Loft in fimple diftillation, as formerly fhewn, 660 



f 



Oxygen taken up by the charcoal, equal to 

 9/6 parts in 100 - - 168 grs. 



In this ftate the ftone was pulverulent, much frittered, and 

 of a darkifh grey colour. Its fra&ure exhibited a number of 

 white fpots like madrepore. In many places lime was dif- 

 tinftly perceived : when pulverifed, it fparkled in the flame, 

 difTblved rapidly in acids with a violent effervefcence, was 

 lefs magnetic than the former, though poffeffing a great 

 tendency to adhere in the form of fibres. From this treat- 

 ment the practical analyfis of this ftone will (land as follows: 



In the affay furnace it yielded, of fuper-carbonated crude 

 iron, - - - 37-5 parts 



Water, acid, and fulphur loft, as for- 

 merly fhewn, - s7'7 



Oxygen taken up in the firft ftage of 

 de -oxygenation - 9'6 



Afterwards taken up in cementing the 

 iron -(tone to render it malleable - - 4-9 — 14*5 



Clay, lime and filex - - . - 10*3 



100 parts 

 By diflblution in acids, I found the earthy parts to be nearly 

 as follows : Lime 5-2— Clay 3-1 — Silex a — 10.3. 



This 



