Though both classes are found artificially compressed, yet they are always distinguishable from each other. One of the best illustrations of this fact, and one already used by Prof. Wilson, is afforded in contrasting two dolichocephalic crania, both obtained by Mr. Blake in his explorations of the ancient cemeteries of Arica and Atacama. Both are evidently of children; one is in its normal condition, symmetrical, and when viewed from above presents the outlines of a graceful oval form, while the other was subjected to such compression as to throw the volume of the brain backward and to greatly deform the frontal bone.[251] A slight tendency to assume the dog-shaped head of the Chinooks of the Columbia River is manifest, where deformation is carried to such an extent as to produce monstrosities. However, even then, the normal brachycephalic type of skull of the Chinooks is not transformed to the dolichocephalic, since the base of the cranium remains comparatively unaffected while distension takes place in a posterior and upward direction. Mr. Squier in his _Peru_ (p. 580, Appendix), has shown that circular compression produces a symmetrical effect in the same direction. The custom of artificially flattening the head has, upon investigation, been shown not to be peculiar alone to the aborigines of America, but to have been practised by many of the semi-civilized peoples of antiquity in different parts of Europe and Asia. Hippocrates, in his treatise _De Aëre, Aquis, et Locis_, has described this savage practice among a people whom he calls _Machrocephali_, supposed to have inhabited the region near the Palus Mæotis, in the vicinity of the Caucasus. He says, “The custom stood thus: as soon as the child was born, they immediately fashioned its soft and tender head with their hands, and by the use of bandages and proper arts, forced it to grow lengthwise, by which the spherical figure of the head was prevented and the length increased.” Strabo refers to a people occupying a portion of Western Asia, who were addicted to the same custom and had foreheads projecting beyond their beards.[252] Pliny places them in Asia Minor,[253] while Pomponius Mela places the Machrocephali on the Bosphorus.[254] Blumenbach has figured in his first decade, a compressed skull obtained by him from Russia and probably originally from one of the tumuli of the Crimean Bosphorus, where it is supposed to have been exhumed during the Russian occupation. In 1843, Rathke figured and described in Müller’s _Archiv für Anatomie_, another example of the compressed human crania, obtained from an ancient grave near Kertsch in the Crimea. In 1820, Count August von Brenner obtained on his estate at Fuersbrunn near Grafenegg in Austria, a skull of similar characteristics. This was, upon examination, decided to have belonged to an Avarian Hun. Prof. Retzius described it in the _Proceedings of the Royal Academy of Sciences of Stockholm in