Value of Native Gold, dc. 213 
from 18176 to 18703, and, therefore, that in its pure state, 
unmixed with any extraneous matter, its value exceeds that 
of Standard Gold; while, as far as can be judged from the 
few experiments which I have been able to make, as well as 
from the returns which have been furnished to me of the 
actual chemical analysis of certain specimens, the. Gold 
from California will range in its specific gravity from 17272 
to 17809. I have not data at present to determine the 
matter more closely. The following Table has been com- 
puted in order to enable any person to ascertain at once the 
amount of. Gold and Silver contained in an ounce of mixed 
metal of various specific gravities ranging from 18500 down 
to 17100, and at the same time the actual value of the 
compound at the rates before stated. The range of the 
Table is limited, but it is hardly probable that any native 
Gold will fall below 17100, or exceed materially 18500. It 
would, however, should such a case occur, be easy to extend 
the Table, for it is evident from an inspection of the column 
of differences, that there is a steady law of progression, the 
differences being nearly constant. 
SAY os ates: 
Specific Pea | Weight | Weight | Value of } Value of | Value per 
Gravity of Weicht| of of Pure Gold at Silver | Ounce of Difference 
Sample. d~"|Pure Gold.| Silver. |77s. 10°42d.) at 65°65 |Mixed Metal, 
oes ti Yaa iraa OF se aon We PN MaRART ERO OY 
18500 | 480 | 456°55 | 23°45 | 80 9°58 | 320] 81 0:78 
12:99 
{8300 450:05 | 29.95 | 79 777 | 4:09 | 79 11°79 
14°J1 
18100 443 38 | 36°62 | 78 56 5:00 | 78 106 
13°5 
17900 436°58 | 43:42 | 77 3171 5:93 | 77 910 
13°85 
17700 429°61 | 50°39 | 76 0°36] 688 | 76 7-24 
14°12 
17500 422°5 | 57-5 | 74 9°26) 786 | 75 3:12) 
15°45 
17300 415°22 | 64°78 | 73 58 8°85 | 74 2°65 
14°80 
17100 407-77 | 72°23 | 72 1:98) 9°87 | 72 11°85 
