94? Mr. Hatchett’s Experiments on the various Alloys , 
According to the foregoing Table, it appears, that fine gold, 
gold alloyed with silver, gold alloyed with copper, and gold 
alloyed with tin, did not suffer any loss during the experiment. 
Moreover, that gold alloyed with lead only lost three grains, 
chiefly by vitrification. 
That gold alloyed with iron lost 12 grains, which formed scoria. 
That gold alloyed with bismuth also lost 12 grains, chiefly 
by vitrification. 
That gold alloyed with antimony lost the same quantity, 
partly by volatilization, and partly by vitrification. 
That gold alloyed with zinc lost one pennyweight, by vola- 
tilization. And, 
That gold alloyed with arsenic, not only lost the whole 
quantity of alloy, but also two grains of the gold, which were 
carried off in consequence of the rapid volatilization of the arsenic. 
Lewis, (Phil. Comm, of Arts, p. 88,) however, asserts that 
“ gold is more volatilized by antimony than by arsenic or zinc ; 
“ but to produce this effect the fire must be vehement, the 
“ crucible shallow, and the air strongly impelled.” These cir- 
cumstances, according to their variations, must undoubtedly 
very much influence the results of such experiments ; and 
therefore, although the reverse was found to take place in the 
experiments here stated, it does not follow that certain changes 
should not be produced by different degrees of heat, by the 
figure of the vessels, and by a current of air more or less strong. 
The whole of the experiments of this section tend to prove, 
that (agreeably to general practice and opinion) only two of the 
metals are proper for the alloy of gold coin, namely, silver and 
copper; as all the others either considerably alter the colour, 
or diminish the ductility, of gold. In respect to the latter quality. 
