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In November 1961, the painter made a trip to New York which inspired him to produce a series of metal plaques, “Metalli,” until 1968.

Metalli fossores, 1. ingrediuntur Puteum fodinæ, 2.

Compare also, Carli, Del Valore della Proporzione dei Metalli monetati con i Generi in Italia prima delle Scoperte dell' Indie, 1760, in which he, indeed, exaggerates the matter, and seeks to prove his views by the coarsest sophistry.851.The chief result of Helferich's excellent researches.

Ignotum est an aliquid metalli subsit montibus, ... etsi aspectus eorum mineras latentes prae se ferat.

Nee minùs ignotum est an aliquid metalli sub sit montibus.