79 
Iron • 
The fracture of this iron-stone was now of a bright 
brown colour, streaked with lime, faintly marked with in* 
ternal fibre, less tenacious to the tongue than the for- 
mer class, but equally obedient to the magnet. 
The residue, weighing as above - - 1090 grs. 
was returned to the furnace, and exposed in the 
bottom of a deep crucible, till such time as a 
slight indication of fusion was observed ; when 
cooled, the pieces weighed - - 1235 
wmjaKix x! CTMg eg r a m U-o 
Gained in weight by the fixation of oxygen 
equal to 13*3 per cent. - - - 145 grs, 
In its present state this iron-stone, in point of colour, 
resembled the former. 
Its fracture, however, was smoother, and more vitrified, 
equally destitute of tenacity to the tongue, and obedience 
to the magnet. 
3. An iron-stone, which contained a proportion of silice- 
ous sand , was exposed under similar circumstances to the 
-same degree of heat-— quantity used 1750 grs* 
When properly torrefied, weighed - 1248 
Lost in simple distillation equal to 28*6 per 
sent. - 502 grs* 
The appearance which this stone had assumed was of a 
reddish, sun 11, granulated fracture, considerably magne- 
tic, but scarcely possessing any degree of adhesion to the 
tongue. 
The residue, weighing as above - 1248 grs* 
was exposed to an equal degree of heat with 
the former classes, by which the stone suffered 
throughout a slight degree of fusion— when 
cool, the connected mass weighed - 1431 
Gained in weight by the combination of oxy- 
gen equal to 1 4 s 6 
183 
