In the mounds we find many works of copper but none of bronze. This may
indicate one of two things: either the colonies which settled the
Mississippi Valley may have left Atlantis prior to the discovery of the
art of manufacturing bronze, by mixing one part of tin with nine parts
of copper, or, which is more probable, the manufactures of the Mound
Builders may have been made on the spot; and as they had no tin within
their territory they used copper alone, except, it may be, for such
tools as were needed to carve stone, and these, perhaps, were hardened
with tin. It is known that the Mexicans possessed the art of
manufacturing true bronze; and the intercourse which evidently existed
between Mexico and the Mississippi Valley, as proved by the presence of
implements of obsidian in the mounds of Ohio, renders it probable that
the same commerce which brought them obsidian brought them also small
quantities of tin, or tin-hardened copper implements necessary for their
sculptures.
The proofs, then, of the connection of the Mound Builders with Atlantis
are:
1. Their race identity with the nations of Central America who possessed
Flood legends, and whose traditions all point to an eastern, over-sea
origin; while the many evidences of their race identity with the ancient
Peruvians indicate that they were part of one great movement of the
human race, extending from the Andes to Lake Superior, and, as I
believe, from Atlantis to India.
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