The same condition is seen also when the basion-nasion diameter is compared with the length of the skull. In the males, notwithstanding the fact that the length of the vault is increased through the development of the frontal sinuses and not infrequently also through that of the occipital ridges, the percentage relation of the basion-nasion to the maximum total length of the vault is approximately _56.3_, in the females but _55.8_. It seems therefore safe to say that in the Eskimo, in general, that part of the brain anterior to the foramen magnum is relatively somewhat better developed in the males than in the females. But to this there are some exceptions. Thus it may be seen in the general table which follows that in the northwestern groups conditions in this respect are equalized; and in the succeeding detailed table it will be noted that while the males exceed the females in this particular in 14 of the groups, in 5 groups conditions are equal (or within one decimal), and in 5 the female percentage exceeds slightly that in the males. In the numerically best represented groups conditions are nearly equal, with the males nevertheless slightly favored. ESKIMO SKULLS: BASION-NASION LENGTH AND ITS RELATION TO LENGTH OF SKULL SEXES SEPARATELY IN ASCENDING ORDER -----------------------------+--------------+-------------- | Males | Females +--------------+-------------- | B-N. | B-N. |BN×100/Skull l|BN×100/Skull l -----------------------------+--------------+-------------- _Southwestern | | and Midwestern_ | | | (4) | (7) Little Diomede Island | 10.18 _56.2_| 9.91 _54.9_ | (3) | (2) Chukchee | 10.20 _54.8_| 10.00 _54.8_ | (3) | (3) Pilot Station (Yukon) | 10.27 _54.3_| 9.97 _56_ | (9) | (4) Hooper Bay | 10.29 _57.6_| 9.70 _55.7_ | (4) | (6) Mumtrak | 10.32 _57_ | 9.52 _55.1_ | (146) | (133) St. Lawrence Island | 10.36 _56.3_| 9.93 _56.1_ | (3) | Yukon Delta | 10.37 _55.8_| | (11) | (18) Pastolik | 10.41 _56.5_| 9.98 _56.3_ | (8) | (6) St. Michael Island | 10.44 _57.3_| 9.98 _56.3_ | (9) | (15) Nelson Island | 10.46 _55.8_| 9.73 _55.9_