The _alveolar angle_ is more variable. It shows considerable individual, sex, and group differences. It averages slightly to moderately higher, which means a more open angle or less slant in the males than in the females. In the Eskimo as a whole it was seen to be approximately 56° in the males, 55° in the females; in the Munsee Indians (Bull. 62, Bur. Amer. Ethn.) it was males 59°, females 57°; in the Arkansas and Louisiana skulls (J. Ac. Sci., Phila., 1909, XIV) it averaged males 55°, females 52°. In my catalogue material it shows a group variation of 46.5° to 55.5° in the negro, 47.5° to 52.5° in the Australians, 46.5° to 50.5° in the Melanesians. In the whites it generally exceeds 60°. Differences in facial and alveolar protrusion among the Eskimo according to area are small, yet they are not wholly absent. The figures below show that in the southwesterners and midwesterners, where the skull is more rounded, the prognathism is smallest; and that toward the north and northeast, where the skull is narrower and the palate (dental arch) tends to become longer, prognathism increases. The "Old Igloo" group shows once more such affinity with the Greenlanders that it is placed with the third subdivision. ESKIMO SKULLS: FACIAL AND ALVEOLAR ANGLE WITH PRINCIPAL AREAS ----------------+---------------------------+--------------------------- | Males | Females +-------+---------+---------+-------+---------+--------- | South-| | North | South-| | North | and |Northwest| and | and |Northwest| and |midwest| |northeast|midwest| |northeast ----------------+-------+---------+---------+-------+---------+--------- Groups | (13) | (5) | (6) | (13) | (5) | (6) Facial angle | 68 | 69 | 70 | 67.5 | 69 | 70 Alveolar angle | 55 | 56 | 55 | 54 | 55 | 54.5 ----------------+-------+---------+---------+-------+---------+--------- Individual group differences in the facial and alveolar angle are moderate, yet evidently not negligible. (See next table.) The most prognathic, especially in the subnasal region, are the skulls from Nelson Island. A marked alveolar slant is also present in the Pilot Station Yukon group, and in Greenland. The least prognathic are the St. Michael Islanders, the Point Hope people, and those from Southampton Island. St. Lawrence stands once more near the middle of the southwesterners and midwesterners, and there are to be seen the principal old relations. The main points shown by the above conditions are the group variability, particularly in the southwest and midwest; the tendency, on the whole, toward a slightly greater prognathy, both facial and alveolar, in this same area; and the evidence that the alveolar slant has some individuality.