>3 S’ 
Iran. 
master, which are better than any thing of the kind 1 hav& 
seen elsewhere, though intermixed with some specula- 
tion. 
On the Assaying of Iron Ores and Iron Stones by 
Fusion . By Mr. David Mush jet, of the Clyde Iron 
Works . 4 Phil. Mag . 178. 
In our manufactories, the just combination of art with 
science is what we can seldom boast ; in authors, the same 
happy union of theory and practice is also markedly defi- 
cient ; and we have constantly to regret, that the want of 
liberality in the individuals of the one class, and opportu- 
nity in that of the other, prevent us from feeling the happy 
effects of this so much desired union. 
The process of depriving ores of their metal by fusion 
in the assay-furnace, and that part particularly relating to 
iron, which I mean to make the principal subject of this 
paper, lead me more immediately to make these observa- 
tions. With the manufacturer, in general, the uses and 
propriety of the assay-furnace are seldom admitted, or, 
at best are restricted to such narrow limits as to be only 
capable of ascertaining the quantity of iron contained in 
ore or iron-stone. The chemist, on the other hand intent 
only upon effecting his operation, and of giving accuracy 
to the result, confines his observations to a certain chain 
of science, and seldom or never considers manufactures 
as the ultimate and happy end towards which his labours 
should be directed. 
With whatever deference and respect we look up to the 
names of men celebrated for their indefatigable zeal and 
industry in the cause of science, and with whatever satis- 
faction we rest upon the result of their labours as to truth ; 
yet, in general, the practical man feels dissatisfied with the 
manner in which those subjects are treated which come 
more immediately under his own observation. 
