Chapter VI: Human History 106

(1) The outline of human history can be roughly dated by (2)
estimating the length of the geological eras. (3) Little is
known as to the evolution of the Primate stock, but (4) the
association of geological data, fossils, and cultural data give
a table of human history. (5) Fossil remains of man before the
fourth glacial epoch. (6) Neanderthal man in the fourth glacial
epoch. (7) Numerous remains in the post-glacial epoch. (8)
Putting aside eoliths, (9) we have Lower, Middle, and Upper
Palaeolithic cultures, followed by (10) Neolithic culture and
(11) the age of metals. (12) Putting together fossil and
cultural evidence, we reach a scheme the details of which can be
filled in by (13) our knowledge of existing primitive races with
(14) certain reservations.