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Rh Bronze Age of Europe were the people described by Plato, who were workers in metal, who were highly civilized, who preceded in time all the nations which we call ancient. It was this people who passed through an age of copper before they reached the age of bronze, and whose colonies in America represented this older form of metallurgy as it existed for many generations.

Professor Desor says:

"We are asked if the preparation of bronze was not an indigenous invention which had originated on the slopes of the Alps?… In this idea we acquiesced for a moment. But we are met by the objection that, if this were so, the natives, like the ancient tribes of America, would have commenced by manufacturing utensils of copper; yet thus far no utensils of this metal have been found except a few in the strand of Lake Garda. The great majority of metallic objects is of bronze, which necessitated the employment of tin, and this could not be obtained except by commerce, inasmuch as it is a stranger to the Alps. It would appear, therefore, more natural to admit that the art of combining tin with copper—in other words, that the manufacture of bronze—was of foreign importation." He then shows that, although copper ores are found in the Alps, the probability is that even "the copper also was of foreign importation. Now, in view of the prodigious quantity of bronze manufactured at that epoch, this single branch of commerce must itself have necessitated the most incessant commercial communications."

And as this commerce could not, as we have seen, have been carried on by the Romans, Greeks, Etruscans, or Phœnicians,