The craniology of Peru offers peculiar difficulties. It was the policy of the rulers to remove large numbers of conquered tribes to distant portions of the realm in order to render the population more homogeneous. This led to a constant blending of physical traits. Furthermore, nowhere on the continent do we find skulls presenting more grotesque artificial deformities, which render it difficult to decide upon their normal form. When the latter element is carefully excluded, we still find a conflicting diversity in the results of measurements. Of 245 Peruvian crania in the collection of the Academy of Natural Sciences, Philadelphia, 168 are brachycephalic, 50 are dolichocephalic, and 27 mesocephalic. Of 13 from near Arica, all but one are dolichocephalic. Of 104 from Pachacamac, 93 are brachycephalic and none dolichocephalic. It is evident that along the coast there lived tribes of contrasted skull forms. From the material at hand I should say that the dividing line was near Pisco, those south of that point having elongated, those north of it rounded heads. The true Kechuas and Aymaras are meso or brachycephalic. The crania from the celebrated cemetery of Ancon, which is situated on the coast near Lima, are mostly deformed, but when obtained in natural form prove the population to have been mesocephalic, with rounded orbits (megasemes) and narrow prominent noses (leptorhines). An average of six specimens yielded a cubical capacity of 1335 cub. cent.[295] The cubical capacity of the Peruvian skulls from the coast generally averages remarkably low--lower than that of the Bushmen or Hottentots. Careful measurements give the capacity at 1230 cubic centimeters.[296] They almost reach the borders of microcephaly, which Broca placed at 1150 cubic centimeters. Although the Spanish writers speak of the Inca as an autocratic despot, a careful analysis of the social organization of ancient Peru places it in the light of a government by a council of the gentes, quite in accordance with the system so familiar elsewhere on the continent. The Inca was a war-chief, elected by the council as an executive officer to carry out its decision, and had practically no initiative of his own. Associated with him, and nearly equal in power, was the _huillac huma_, or “speaking head,” who acted as president of the tribal council, and was the executive officer in the Inca’s absence. The totemic system still controlled the social life of the people, although it is evident that the idea of the family had begun to assert itself. The land continued to be owned by the gens or _ayllu_, and not by individuals.[297]