Value of Native Gold, ce. 209 
of the compound in this case 17486. ¢ the weight of the 
compound, or 480 grains— 
Sas 
DS s)7 
there will therefore be 422 grains of Gold and 58 grains of 
Silver in a specimen of mixed Silver and Gold weighing 
480 grains, and whose specific gravity is 17486. In this 
c++ in this case will be equal to 58 ers. ; 
case the Silver is pure; and in order to decide as to the 
market value of this ingredient, it will be necessary to 
ascertain the amount of alloy by which pure Silver is re- 
duced to standard, the value of which, at the established 
ratio which it bears to Gold, namely, 1 to 15%$, is 60°78d., 
or about 603d. per ounce. The proportion of copper which 
is introduced in order to lower pure Silver to standard is 2s ; 
that is, 387 parts of pure Silver and 3 of Copper make 40 
parts of Standard Silver: the value of this compound is, as 
we have seen, 60°78d. per ounce, of which 444 grains consist 
of pure Silver, and 386 of Copper. ‘The value of the Copper 
is 386 x ‘002072. The value of the Silver is equal to 
60°78d— 072 60°708d. 
Fi AEE ma aoe UE 
As there are 58 grains of pure Silver and 422 grains of 
= 0°15678 of a penny per grain. 
pure Gold in an ounce of the mixed metal, whose specific 
gravity is 17486, the actual value of the compound will be— 
Grains. S. d 
422 ates iQa — oie > 82 
58 at *1367 7°93 
Wopeele 
And as the value of the same quantity 
of Standard Gold alloyed with Copperis 77 10:5 
Honcvaaeneh sonnce se ecengée aaa uaonae nee SZihe Oho! 
is the measure of the inferiority of the value of this alloy of 
Silver as compared with that of Copper in the Standard 
Gold coin of England. 
the difference, or 
