from the so-called primitive Malay peoples of southeastern Asia; that
in their movement eastward and northward they met with and absorbed
remnants of an earlier migration made up of a people closely related
to the Polynesians, and that the results of this intermixture are
still evident, not only in Luzon, but in every part of the Archipelago.

In northern Luzon, I hold, we find evidences of at least two series
of waves and periods of migration, the members of which are similar
physical type and language. It appears, however, that they came
from somewhat different localities of southeastern Asia and had, in
their old homes, developed social organizations and other elements
of culture radically different from one another--institutions and
groupings which they brought with them to the Philippines, and which
they have maintained up to the present time.

To the first series belong the Igorot [1] with their institutions of
trial marriage; division of their settlements into social and political
units known as _ato_; separate dormitories for unmarried men and women;
government by the federated divisions of a village as represented by
the old men; and a peculiar and characteristic type of dwelling.

In the second wave series we find the Apayo, the western division at
least of the people known as Kalinga, the Tinguian, and Ilocano. [2] In
none of these groups do we find the institutions just mentioned. Trial
unions are unknown, and marriage restrictions are based solely on
blood relationship; government is through the headman aided by the
elders of his village, or is a pure democracy. Considerable variation
exists between the dwellings of these four peoples, yet they conform
to a general type which is radically different from that of the Igorot.