---------------------------------+-------------------+-------------------
| Groups of males | Corresponding
| | groups of females
+--------+----------+--------+----------
| | Its | | Its
| Basion-|percentage| Basion-|percentage
| nasion | relation | nasion | relation
|diameter|to length |diameter|to length
| | of skull | | of skull
---------------------------------+--------+----------+--------+----------
| (13) | (13) | (13) | (13)
Southwestern and Midwestern | 10.38 | _56.4_ | 9.85 | _55.7_
| (6) | (6) | (6) | (6)
Northwestern | 10.58 | _56.4_ | 10.06 | _56.3_
| (5) | (5) | (5) | (5)
Northern Arctic and northeastern | 10.65 | _56.2_ | 10.06 | _55.4_
---------------------------------+--------+----------+--------+----------
The female measurement to that of the male, in the Eskimo, is as _94.9_
to 100. As a similar relation of the cranial modules in the two sexes
is close to _95.7_, the anterior basal length would seem to be at a
little disadvantage in the female Eskimo skull.
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