n 
Iron. 
* 
1. There were introduced into an iron test seme pie- 
ces of argillaceous iron-stones, weighing - 1750 grs 0 
After being exposed to a bright red heat for 8 
hours, and then allowed to cool, they weighed 1160 
Lost in simple distillation - • 590 grs. 
Equal to 33° 6 per cent. Specific gravity in this 
state 2,52150. 
The stone had now assumed a claret colour, and was 
possessed of regular internal fibres, adhesive to the tongue, 
obedient to the magnet, and exhibiting every property pe- 
culiar to excellent iron-stone. 
I returned the residue, which, as above, weighed 1160 grs* 
and exposed it in an open crucible for 4 hours 
to an increasing heat till a slight degree of fusion 
was perceived to take place. This was indicated 
by the angles of the pieces becoming rounded, 
and swelling a little in bulk — When cool they 
were found slightly porous, and weighed - 1309 
Increased in weight by the combination of 
oxygen - - - - 149 grs. 
Equal to 12.8 per cent. Specific gravity in this state 
3*3636. 
The fracture of the pieces now wore a semi-vitrified 
appearance, of a dark blue colour, inadhesive to the 
tongue, unmagnetic, but much more metallic and pon- 
derous. 
A calcareous iron-stone treatedafter the same manner, 
of which I also used small pieces, weighing 1750 grs. 
which had yielded a similar product in iron in 
the assay-furnace with the former, when cool 
weighed - - 1090 
Lost in simple distillation equal to 37*7 per 
cent -*■«»*- 660grs a 
