!40 On the Jtjjhiifm nj 



and ncarlv dropping. When cold I found the fusion in- 

 complete, and coidd only collect in all -10 grains of iron. 

 iir/). IX. 400 grains of raw ironstone, 



80 of cliarcoal, 



100 of chalk. 



This mixture fused with facility in a row heat. The re- 

 sult was a crystallized button of crude iron which weighed 

 112 grains j equal to 28 per cent. 



Recapitulation of experiments with argillaceous Ironstone. 

 JSj'/j. I. No metal revived. ptr cent. 



fl. I -80lh of carbon yielded 8J- grs. iron, or 2J- 



IH. l-57th ditto ' 15^ ditto, or 3VuV 



35 ditto, or S'J- 

 5f) ditto, or 141 

 77 ditto, or 19^ 

 S4,V ditto, orSlVo 



unfuscd. 



And 100 grains of chalk 1I2 ditto, or 28 



A quantity of this argillaceous ironstone was torrified, 

 and found to lose 31 per cent. It had then assumed a 

 brownish red colour, which darkened considerablv in 

 pounding. It was found to be easily overheated in roasting, 

 and then assumed a semi-vitrified fracture, losino; its adhe- 

 sion to the tongue. If the heat is carried to a faint white, 

 the mass becomes of a blackish blue colour, swells up and 

 resolves itself into the state of a honeycomb, increased in 

 bulk and in weight. 



JLxp. I. 200 grains of this ironstor.s povmded was fused 

 ppr se, and in the first experiment was found a minute glo- 

 oule of iron estimated at l-3d of a grain. The experiment 

 was twice repeated, bvit without any metal being revived. 

 In the first ease, therefore, the revival of the iron was most 

 likely occasioned by a small portion of the fuel being acci- 

 dentally thrown into the crucible. 



Exp. II. 500 grains of roasted ore, 



12^ of carbon, or 1 -40th. 



There resulted from the fusion of this mixture three per- 

 fect globules of iron which weighed 4 grains, which is about 

 8-l()ths per cent. These were found in the bottom of an 

 elliptical cavity possessed of the highest lustre and a variety 

 of prismatic tints. 



^.r/v. III. 400 grains of roasted ironstone, 



44 — : — of charcoal, or i-gth nearlv. 



' This 



t 



