BOOK VII.

265

weights in one pan, and in the other, ore or metal as heavy as that weight.The third is the most delicate, and by this we weigh the beads of gold orsilver, which, when the assay is completed, settle in the bottom of the cupel.But if anyone weighs lead in the second balance, or an ore in the third, hewill do them much injury.

Whatsoever small amount of metal is obtained from a centumpondiumof the lesser weights of ore or metal alloy, the same greater weight of metalis smelted from a centumpondium of the greater weight of ore or metal alloy.

A —First small balance. B —Second. C— Third, placed in a case.

Ay -a

ipiip

nil

= ^

W'W/W/s

mm.

wm,

II^SIO

H

111

iilii

liil

END OF BOOK VII.