and Observations on JVootx. 
339 
k. By repeated ignition in a rather open vessel, and by ham- 
mering, it becomes wrought or forged iron. 
l. It affords a residue of at least ^ its weight of carbon on 
dissolution in diluted sulphuric acid. 
m. It is more sonorous than forged iron. 
n. On quenching in cold water, when ignited, it retains about 
of the extension produced by ignition ; whereas wrought iron 
so treated returns to nearly its former magnitude. 
iii. By the term Crude , or Raw Iron , I understand that 
kind of iron which possesses the following properties : 
a. It is scarcely malleable at any temperature. 
b. It is commonly so hard as to resist totally, or very con- 
siderably, the file. 
c. It is not susceptible of being hardened or softened, or 
but in a slight degree, by ignition and cooling. 
d. It is very brittle, even after it has been attempted to be 
softened by ignition and cooling gradually, 
e . It is fusible, in a close vessel, at about 130° of Wedg- 
wood's pyrometer. 
/. With sulphuric acid it generally decompounds a smaller 
quantity of water than an equal weight of steel. 
g. It decompounds water in the cold more slowly than 
wrought iron. 
h. It unites to oxygen of oxygen gaz as slowly, or more 
slowly than even steel. 
i. By solution in sulphuric and other acids, it leaves a resi- 
due not only of carbon, but of earth ; which exceed the quan- 
tity of residue from an equal weight of steel. 
k. It is perhaps more sonorous than steel. 
