5 6 Mr. Hatchett’s Experiments on the various Alloys , 
slight degree less brittle, as it did not so immediately break 
under the hammer. 
The foregoing experiments prove, that £ of a grain of anti- 
mony in the ounce, or T -g™ P art °f the mass, can destroy the 
ductility of gold. 
The following experiments were made to ascertain the effects 
of the vapour or fumes of antimony upon gold, when close and 
when open vessels were employed. 
Experiment vii. 
480 grains of fine gold were exposed, in close vessels, to the 
fumes of about 480 grains of antimony, under circumstances 
similar to those described in the third experiment upon arsenic. 
When the crucibles were unluted, the chief part of the anti- 
mony was found, unchanged, at the bottom of the inferior large 
crucible. 
The button of gold in the small crucible was not altered in 
the external colour, but proved to be extremely brittle, for it 
immediately split under the hammer, and exhibited a close 
grained earthy fracture, of an ash colour. 
After the experiment, the button weighed 483,9 grs. ; so that 
it had acquired 3,9 grs. of antimony. 
Experiment vm. 
A small four-inch crucible, containing 480 grains of fine gold, 
was placed within another, of 12 inches; and four ounces of 
antimony were put into the large outer crucible, as soon as the 
gold appeared to be perfectly melted. 
When half an hour had elapsed, the small crucible was 
