All the white race have teeth vertical, the jaw short; and
the manner in which the teeth fit one upon the other is
perpendicularly, so that when we close the mouth we bring the
lower teeth against the upper teeth in such a juxtaposition that
the two sets stand vertical, one above the other. The races of
men which have that kind of dentition are called orthognate;
that is, straight-jawed races; while there are other races--and,
among others, all the inhabitants of the South Sea Islands and
all the inhabitants of Africa south of the Atlas--that have
their front teeth inclined, so that the upper teeth and the
lower teeth, when brought against one another, form an angle
and the mouth is more prominent; these men are called prognate.
And that difference is a constant one. All the races of men
with prognate jaws have also thicker and more prominent lips.
They have also flat noses, which I have already described, with
broad partitions between the nostrils, and the nostrils opening
sideways.--Prof. LOUIS AGASSIZ.
(2607)