The next table gives the percentage relations of the basion-nasion diameter to the mean diameter of the skull. The correlation of the two is even closer than in the case of the skull length, and the grouping, while in the main alike, seems in general even more in harmony with that in previous comparisons. The St. Lawrence Island females are very exceptional, as was also apparent in other connections. The unusual smallness of their skull (compare section on Cranial module) is evidently due to a poor development of its posterior half. ESKIMO CRANIA: PERCENTAGE RELATION OF THE BASION-NASION DIAMETER TO MEAN CRANIAL DIAMETER (CRANIAL MODULE) (BN×100/CM) BOTH SEXES TOGETHER IN ASCENDING ORDER _Southwestern and Midwestern_ Pilot Station, Yukon 65.6 Chukchee 66.0 Little Diomede Island 66.1 Hooper Bay 66.4 Nelson Island 66.7 Togiak 66.9 Southwest Alaska 67.3 Indian Point, Siberia 67.4 Mumtrak 67.4 Nunivak Island 67.6 Pastolik 67.6 St. Michael Island 68.0 St. Lawrence Island: Male 67.2 Female (69.6) _Northwestern_ Wales 67.7 Point Barrow 67.8 Point Hope 68.1 Barrow 68.4 Old Igloos 69.0 Shishmaref 69.2 _Northern Arctic and northeastern_ Baffin Land 67.4 Hudson Bay 67.6 Smith Sound (male) 67.6 North Arctic 68.1 Greenland 68.5 Southampton Island 68.7 PROGNATHISM Since better understood, the subject of facial prognathism has lost much of its allure in anthropology; yet the matter is not wholly without interest. Facial protrusion is as a rule secondary to and largely caused by alveolar protrusion, which in turn is caused by the size and shape of the dental arch; and the dental arch is generally proportional to the size of the teeth. The form of the arch is, however, quite influential. With the teeth identical in size a narrow arch will be more, a broad arch less protruding, and a narrow arch with small teeth may protrude more than a broad one with larger teeth. Another influence is that of the height of the upper face, the same arch protruding more in a low face than in a high one. And still another factor is the incline of the front teeth, though this affects merely the appearance of prognathism and not its measurements.