82 Mr. Hatchett’s Experiments on the various Alloys , 
An ounce of fine gold was placed in the middle of the emery ; 
the crucible lined with charcoal was closed by a stopper of the 
same, and a cover was luted upon the exterior crucible. 
After a very strong heat of one hour and a half, the gold was 
found to be exactly of the same colour, ductility, &c. as before. 
Experiment m. 
The preceding experiment was repeated ; but the heat was 
continued during three hours, so that at length the crucible 
began to be melted. 
It was suffered to cool in the furnace ; and, being afterwards 
broken, the gold was found crystallized in a reticulated form, 
but not altered in colour or ductility. The emery was reduced 
to a dark gray or blackish slag, which occupied the upper part 
of the crucible. 
We have, from the above described experiments, sufficient 
proof that emery will not combine with gold ; and, when the 
difficulty of uniting metallic oxides in general, or any earthy 
substance, with a metal, is considered, it appears singular that 
the existence of such a combination as that of emery with gold 
should ever have been believed. 
It is not however improbable, but that some other substance 
has been occasionally denoted by the term smiris, emeril, or 
emery; and Dr. Lewis appears to be inclined to adopt this 
opinion.* 
GOLD ALLOYED WITH PLATINA. 
Experiment i. 
Eighteen pennyweights and ten grains of gold, 23 car. 3! grs. 
* Phil. Comm, of Arts, p. 607. 
