90 
Iron * 
degree of heat as the former classes : die 
residue weighed - 
Lost in volatile matter by simple distilla- 
tion, equal to 28*6 per cent. 
In its present state the fracture of this iron- 
stone was reddish brown, studded with spi- 
cules of shining silex, slightly adhesive to 
the tongue, and considerably obedient to the 
magnet, 
I next introduced into a crucible, stratified 
with charcoal-dust, some pieces of the same 
mass, weighing - 
and exposed them to a degree of heat of 
equal intensity with the former ; after the pie- 
ces were washed, and carefully dried, they 
weighed ------ 
1249 
501 
2374 grs* 
1343 
Amount of water, acid, sulphur, and oxy- 
gen dissipated - - - » 1031 grs. 
Equal to - - 43*4 parts in 100 
Lost in simple distillation as 
above - 28*6 
Oxygen taken up 14*8 
This iron-stone was frittered, very magnetic, but dis- 
solved less rapidly in acids, and with less effervescence 
colour of the fracture light grey, and slightly spongy. The 
practical analysis of this siliceous iron-stone will there- 
fore stand thus : 
Carbonated crude iron obtained in the 
t assay furnace - - - - - 36 parts. 
Water, acid, and a considerable portion 
of sulphur - - 28*6 
Oxygen taken up as above - 14*8 
Further, as will hereafter Le shewn 
- 
ve, 
