--------------------+---------------------+--------------------- | Males | Females Area +------+-------+------+------+-------+------ | Mean | Mean | Mean | Mean | Mean | Mean |height|breadth|index |height|breadth|index --------------------+------+-------+------+------+-------+------ | (13) | (13) | (13) | (13) | (13) | (13) South and Midwestern| 3.63 | 4.01 |_90.6_| 3.56 | 3.87 |_92.1_ | (6) | (6) | (6) | (6) | (6) | (6) Northwestern | 3.62 | 4.02 |_90.1_| 3.51 | 3.92 |_89.7_ Northern Arctic and | (5) | (5) | (5) | (5) | (5) | (5) northeastern | 3.65 | 4.07 |_89.5_| 3.54 | 3.91 |_90.6_ --------------------+------+-------+------+------+-------+------ The group differences in the orbital index of the Eskimo skull are shown in the next table. They elude a satisfactory explanation, unless recourse is had to the above suggested theory of normal group variability within a family. They have about the same range in the three large areas, which would seem to support this theory. Group relations are indicated in the cases of Pastolik-Yukon Delta-St. Michael Island; Point Barrow-Barrow; and Old Igloos-Greenland. ESKIMO SKULLS: MEAN INDEX OF THE ORBITS BOTH SEXES TAKEN TOGETHER IN ASCENDING ORDER _Southwestern and midwestern_ (10) Mumtrak 88.4 (11) Little Diomede Island 89.4 (6) Cape Nome and Port Clarence 89.7 (101) Nunivak Island 90.1 (31) Indian Point (Siberia) 90.3 (5) Chukchee 90.6 (6) Pilot Station, Lower Yukon 91.0 (5) Southwest Alaska 91.4 (271) St. Lawrence Island 91.7 (24) Nelson Island 91.9 (13) Hooper Bay 92.5 (29) Pastolik 93.2 (7) Togiak 93.3 (4) Yukon Delta 93.8 (13) St. Michael Island 94.4 _Northwestern_