The dental arches correlate with function (use), with stature, with
the dimensions of the face, and with those of the teeth. The western
as well as other Eskimo show arches that are about equal in absolute
dimensions to those of our taller Indians, such as the Munsee,
Arkansas, and Louisiana;[155] but relatively to stature the Eskimo arch
is decidedly larger.
The upper dental arch index (L×100/B), now being used in preference
to the unwieldy "uranic index" (B×100/L) of Turner, is rather high,
showing that the arch is relatively, as well as absolutely, broad. The
same index in the Munsee averaged in the males _82.8_, in the females
_82.7_; in the Arkansas and Louisiana mound skulls _84.4_ in the males
and _85.1_ in the females. Data are needed here for more extensive
comparisons.