f he Conversion of cajl Into malleable Iron . 175* 
1 h. 23 m, little heaving or blue flame ; metal {lifter, and 
of a dull red; flame turned on and foon off again. 
1 h. 26 m. by conftant {lining the metal is become as fine 
as fand. Workman remarks, that the flame, which re- 
appears over the whole mafs, looks more kindly. It is evi- 
dently of a lighter blue colour. 
if h. flame turned on and foon off* again. Mafs ferments 
ftrongly. Hiding noife heard : this noiie was diftinguifliable 
in fome degree ever fince the blue flame and heaving motion 
became vifible, but always faint till now. 
I h. 40 m. lefs blue flame. 
1 h. 48 m. flame twice turned on and off in this interval. 
Metal now clots, Hands wherever it is placed, without any 
tendency to flow, and no liquid pig iron now remains in the 
bafon of the furnace ; the mafs has been conftantly flirted and 
turned over. 
1 h. 50 m, a little finery cinder appears boiling up amid the 
mafs. Workman attributes the increafe of the hiding to this. 
I h. 53 m. fcarce any perceptible blue flame or heaving. All 
the metal is now gathered into lumps, which the workman 
beats and prefles with an heavy-headed tool. He brings them 
fucceflively into the hotteft part of the furnace, into which 
the flame has been admitted. He now flops the port hole in 
the door at which he had introduced his tools, and applies a 
fierce flame for 6 or 8 minutes ; the metal is then rolled. 
Thefe appearances, at leaft the moft interefting of them, 
feem to admit of an eafy explanation ; and I offer the following 
obfervations as fupplemental to thofe for which we are already 
indebted to the Swedifh and French chemifts on this impor- 
tant branch of metallurgy. I affume the following propod- 
tions as already proved by thefe philofophers, 1 , That caft 
iron 
