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22 are now only collected as curiosities to be preserved in archæological museums.

Prognathism.

It is to be observed that, as regards the gradual filling up of the cerebral, or anterior portion of the cranium, there are some striking differences in the prominence of the forehead, and the degree of prognathism of the face among living races.

To show the extent and character of these differences, I reproduce from Owen's Comparative Anatomy (vol. ii., pp. 558, 560), illustrations of two skulls, one labelled "Cranium of a native Australian" (Fig. 6), and the other, "Skull of a well-formed European" (Fig. 7), from which it will be at once seen that the former has a retreating forehead and a highly prognathic profile, while the latter has a well-filled forehead and an orthognathic face.