on mixing Gaia with Tin. 4.6 ; 
EXPERIMENTS VIII. AND IX. 
The mixtures of gold and tin, from the fecond and fourth 
experiments, were re-melted feparately, and one ounce of 
copper added to each. Being both well flirred, they were caft 
as ufual; and the bars, though fenfibly harder, bore all the 
operations of manufacturing as before. The laft bar cracked 
a little at the edges, on drawing through the rollers, as it had 
done without the copper, but not materially, and bore cutting 
rather better than in its former ftate. 
EXPERIMENTS X. AND XI. 
A quarter of an ounce of the laft mixture (being tin half 
an ounce, and copper one ounce, with gold twelve ounces), 
and as much of the bar from experiment the third (being tin 
one hundred and twenty grains with gold twelve ounces), were 
each melted by a Jeweller, in the moft ordinary manner, with 
acommon fea-coal fire, intofmall buttons, without any lofs of 
weight. Thefe buttons were forged by him into {mall bars, 
nealing them often by the flame of a lamp, and afterwards | 
drawn each about twenty times through the apertures of a 
ftee] plate, into fine wire, with as much eafe as coarfe gold 
commonly paffes the like operation. 
EXPERIMENT XII. 
To enquire whether the adding of tin to gold, aay 
alloyed, would caufe any difference, fixty grains of tin were 
ftirred into twelve ounces of ftandard Bold, 22) fines and tle 
refult pafled every operation before defcribed, without fhewing 
the leaft alteration from the tin. 
For greater certainty, feveral other trials were made, of dif- 
ferent mixtures of copper, tin, and filver, with gold, even fo 
Vo. LXXIY. Ppp low 
