The American Indian--origin, culture, and language--engaged the best minds of Europe from 1492 to 1729. Were the Indians the result of a co-creation? Were they descended from the Ten Lost Tribes of Israel? Could they have emigrated from Carthage, Phoenicia, or Troy? All these and many other theories were proposed.

How could scholars account for the multiplicity of languages among the Indians, the differences in levels of culture? And how did the Indian arrive in America--by using as a bridge a now-lost continent or, as was later suggested by some persons in the light of an expanding...