2.6 . Observations on Dr. Arbuthnot’j

The Weights of these Coins are as follow ;

gr.

sp.Gr.

supper

- 61.625

10.717

Roma

- 52.25

r 0-4-5

Roma alata

57*^75

10.065 2

Pansa^

~ 55-000

9.86

Ancus

- 59.625"

9-54

I perceive by this Table, that Mr. youbert was wrong insaying that the best of the Consular Coins fell short of ourStandard by ^ Part, but it "is true enough' os the middlingones; for it will appear that Mr. youbert *s Proportion willbring out the specific Gravity 10.279, which is less than thespecific Gravity os yupiter and Roma , but greater than thatos any os the rest. According to Mr. youbert , there are inthe Consular Denarius 5 Parts of Silver, at 10.535 specificGravity, and one Part of Alloy, which if it be of fineCopper, will have the specific Gravity 9.000.

Let 10.535 be multiply'd by 5, the Numberof Parts os Silver, it givesTo which if we add for the one Part of Copper

9.000

They will make - - 61.675

Which being divided by 6, the whole Number of Parts, itwill give 10.279, the specific Gravity, as above.

The Copper is set rather too high at 9.000, for Reasonsgiven before ; but if it were reduced to 8.000, it would givefor the specific Gravity 10.1125, which still exceeds the spe-cific Gravity of all the Denarii *but the two first.

Upon