It now remains to present the salient facts regarding the genetic
relationships of typical human races, although it is obviously impossible
to go into all of the details of the subject. But these are not essential
for the main purpose, which is to show that the evolutionary explanation
is the only one that is reasonable and self-consistent. Opinions are
sometimes widely at variance regarding countless minor points, but no
anthropologist of to-day can be anything but an evolutionist, because the
main principles upon which the specialists agree fall directly into line
with those established elsewhere in zooelogy. It seems best to state these
principles without reverting to controversial matters which find their
place in the monographs of the experts. Any comprehensive account such as
that of Keane, even if it may not give the final word, will be entirely
sufficient to demonstrate how fruitful are the methods of evolution when
they are employed for the study of human races, and indeed how impossible
it is to discuss human histories without finding conclusive evidences of
their evolutionary nature.
The facts that are available indicate that the first members of our
species evolved in an equatorial continent which is now submerged, and
which occupied a position between the present continents of Asia and
Africa.
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