[Factorial analysis of the "proper" angles involved in ethnic prognathism]. / Analyse factorielle d'angles "propres" intervenant dans le prognathisme ethnique.

This work rest on 10 populations, chiefly arising from "musée de l'Homme" (Paris). 9 angles was considered in squeletal profile, and "reciprocal averaging" analysis was made. It shows the main function of peri-buccal segments situation, relatively to palatal and mandibular planes, as well as participation of facial whole situation relatively to anterior neurocranium. This analysis confirm the peculiar position of leucoderm men with reference to other groups.