33 6 Dr. Pearson's Experiments 
water insufficient for crystallization, yielded on cooling a white 
sediment as before. 
This white matter yielded colcothar, a red oxide of iron, by 
applying the flame with the blowpipe. The white matter 
therefore was not siderite but sulfate of iron, which could not 
crystallize on account of deficiency of water. 
§ 7. Experiments with Oxide of JVootz , Steel, and Iron. 
1200 grains of wootz dissolved by diluted sulphuric acid, 
and then precipitated from this acid by pot-ash, yielded 
greenish oxide ; which on drying in a stove became a reddish- 
brown light powder, weighing 2700 grains ; and by ignition 
it was reduced to 2000 grains. 
300 grains of this oxide were made into a paste with linseed 
oil ; which, being wrapped in paper, was put into a crucible 
and exposed for near an hour to a fierce fire in the wind fur- 
nace. On cooling, a cake of metal weighing 200 grains was 
obtained, which had the essential properties of steel. The py- 
rometer denoted 150° of fire. 
The result was the same on treating oxide of steel, and of 
iron, in the same manner as wootz. 
CONCLUSIONS. 
Many of the properties of wootz, related in the preceding / 
experiments and observations, are so generally known to be 
those of the metallic state of iron that, but for the sake of 
order, I should think it superfluous to refer to any of them 
particularly, to support the conclusion that wootz is at least 
