Value of Native Gold, éc. 207 
in which case its specific gravity would be 17316: the 
difference between this and the specific gravity, as deter- 
mined by experiment, is very trifling. 
3. An American gold coin of the value of 50 dollars from the 
Californian Mint, 
Grains. 
Weighed iM aif ..scccccdecsseeseaene L310 
Weighed in water ......sss0seee 1235 
LDTIPERETIOS pacaocorenccencasonn 
1310 
—z5 X 1000 = 17466 Sp. Gr. 
4, An American gold coin of the value of 20 dollars from the United 
States Mint, | 
Grains. 
Weeighed im air .reccsscceesveeee 15°75 
Weighed in water .........00... 486°20 
Difference ..ssccceesereeeee 29°55 
515°7 
30:55 * 1000 = 17453°5 
On reference to Table No. 1, showing the value of -alloys 
of Gold with Silver, it will be seen that these American coins 
are not worth more than £10 5s 3d. and £4 0s. 83d. 
respectively at the mint price of Gold and Silver; and there- 
fore in these Colonies, where deduction must be made for 
freight, insurance, and other charges incidental to the trans- 
mission of these coins as bullion, their market value will be 
very much reduced : indeed, they appear to be inferior in value 
to the ordinary Californian Gold, if we may judge from the 
sample, an analysis of which is given further on in the 
proportion of 75s. 8d. to 77s. 2d. per ounce. If these coins 
are to be taken as the representatives of a given number of 
dollars, the value of that coin in sterling money would 
appear to be 4s. 1d. and 4s. 0zd. The specific gravities of 
