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The following heads are from Del Rio's " Account of Palenque," copied into Nott and Gliddon's "Types of Mankind," p. 440. They show that the receding forehead was a natural characteristic of the ancient people of Central America. The same form of head has been found even in fossil skulls. We may therefore conclude that the skull-flattening, which we find to have been practised in both the Old and New Worlds, was