Compound Sulphuret from Huel Boys. 57 
of only 96.65 grains of it. 100 parts of the ore are therefore 
composed of 
Sulphuret of lead - 49.7 
Sulphuret of antimony 29.6 
Sulphuret of copper - 20.7 
100.0 
It is impossible not to be struck with the trifling alteration 
which these quantities require to reduce them to very simple 
proportions, or to think it a very great violation of probability 
to suppose that experiments, effected with no errors, would 
have given them thus : 
Sulphuret of lead - 50. 
Sulphuret of antimony - 30. 
Sulphuret of copper - 20. 
However, I doubt the existence of triple, quadruple, &c. com- 
pounds ; I believe, that all combination is binary ; that no sub- 
stance whatever has more than two proximate or true ele- 
ments ; and hence I should be inclined to consider the present 
compound as a combination of galena and fahlertz ; and if so 5 
it will be accurately represented, as far as chemical analysis 
has yet been able to go, by the following figure : 
Compound sulphuret 
of lead, antimony, — 
and copper 
j ~ \ galena rr 
u.. 
f \ sulphur 
L t lead 
{ -f sulphuret of _ f | sulphur, 
antimony \ § antimony, 
f sulphuret of _ f $ sulphur, 
copper \ copper. 
Its ultimate elements are therefore. 
Sulphur - 20 . . . = 
Lead - 41! . . . = 
MRCCCVIII. 
I 
