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 or 

 silver, 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, he 

 will do them much injur}'. 



Whatsoever small amount of metal is obtained from a centumpondium 

 of the lesser weights of ore or metal alloy, the same greater weight of metal 

 is smelted from a ccnhimpondium of the greater weight of ore or metal alloy. 



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



END OF BOOK VII. 



