According to a recent translator of Blumentritt[19] that author is
made to say (evidently speaking of the o'-lag):

Amongst most of the tribes [Igorot] the chastity of maidens is
carefully guarded, and in some all the young girls are kept together
till marriage in a large house where, guarded by old women, they
are taught the industries of their sex, such as weaving, pleating,
making cloth from the bark of trees, etc.

There is no such institution in Bontoc Igorot society. The purpose of
the o'-lag is as far from enforcing chastity as it well can be. The
old women never frequent the o'-lag, and the lesson the girls learn
there is the necessity for maternity, not the "industries of their
sex" -- which children of very primitive people acquire quite as a
young fowl learns to scratch and get its food.


Marriage

The ethics of the group forbid certain unions in marriage. A man may
not marry his mother, his stepmother, or a sister of either. He may
not marry his daughter, stepdaughter, or adopted daughter. He may
not marry his sister, or his brother's widow, or a first cousin by
blood or adoption. Sexual intercourse between persons in the above
relations is considered incest, and does not often occur. The line of
kin does not appear to be traced as far as second cousin, and between
such there are no restrictions.

Rich people often pledge their small children in marriage, though,
as elsewhere in the world, love, instead of the plans of parents, is