( HT ) 
the correfponding natural Number?, as they are found 
in the Column of Pounds. 
For the greater Convenience of Calculation, his 
Lordlhip has added Tables j firft of Decimal Parts 
for Penny-weights, Ounces, and Pounds, in order to 
lofe as little as polfible of the Fractions, in the feve- 
ral Calculations. The next are Tables of Grains, 
Penny-weights, Ounces, and Pounds, which readily 
fliew how many of each Denomination are con- 
tained in the others. Tlie Tables entituled. From Grains 
to Penny-weights, if c, and the others from the feveral 
Denominations to others, are of Ufe for carrying the 
Computation readily from any one Denomination to 
another : And laflly, the Tables at the Bottom of 
thefe laft mention'd are of the like Ufe, for the ready 
finding the Value in Money of any Loadftone, from 
the Numbers proper to Grains,, to Penny- weights, to 
Ounces, and to Pounds. ^ 
The Honourable Author then proceeds to explain 
the Ufe of thefe Tables, by Inftances under each De- 
nomination. Thus, if a Loadftone does not exceed one 
Ounce, or 480 Grains, the particular Weight of the 
Stone, with the Weight it fuftains, being known, he 
reduces the Weight fuftained to Grains, by theHeJp of 
the Table of Grains. Then looking into the Column 
of Grains for the Weight of the Stone, againft jt, inthe 
Column of Weight fuflained, he finds the Number of 
Grains, which a Stone of the worfi: Sort of this Weight 
would fuftain ; and then dividing the known 
Number of Grains which this particular Stone, will 
fuftain, by the Number of Grains exprelTed in the 
Column, the Quotient fhews the Charader of Good- 
nefs in the Stone propofed ; and by the Help of this 
Number may be known what Weight any other 
Stone. 
