Note 508 — TIN. TINNING.

I explain the passage in this manner, but I acknowledge that difficulties still remain. I have however thought that it might perhaps be thus understood; that in the process of fusion, as then used, the galena formed the third part of the weight of the ore or paste, and lead a third part of the galena; though I doubt whether the products of metallic works were then so accurately weighed. I shall leave the reader to determine whether the two explanations of Savot are better. He supposes either that Pliny gives three ways of obtaining lead, namely, from lead ore, argentiferous ore, and galena; or that he says that silver forms a third, lead a third, and slag the remaining third. But if the first opinion be correct, why did Pliny say “Plumbi origo duplex?”