even without the intervention of his father, according to the mode
prescribed by our constitution.

1 It is not every woman that can be taken to wife: for mar-
riage with certain classes of persons is forbidden. Thus, persons
related as ascendant and descendant are incapable of lawfully
intermarrying; for instance, father and daughter, grandfather
and granddaughter, mother and son, grandmother and grand-
son, and so on ad infinitum; and the union of such persons is
called criminal and incestuous. And so absolute is the rule, that
persons related as ascendant and descendant merely by adoption
are so utterly prohibited from intermarriage that dissolution of
the adoption does not dissolve the prohibition: so that an
adoptive daughter or granddaughter cannot be taken to wife
even after emancipation.

2 Collateral relations also are subject to similar prohibitions, but
not so stringent. Brother and sister indeed are prohibited from
intermarriage, whether they are both of the same father and
mother, or have only one parent in common: but though an
adoptive sister cannot, during the subsistence of the adoption,
become a man's wife, yet if the adoption is dissolved by her
emancipation, or if the man is emancipated, there is no imped-
iment to their intermarriage. Consequently, if a man wished to
adopt his son-in-law, he ought first to emancipate his daughter:
and if he wished to adopt his daughter-in-law, he ought first
to emancipate his son. 3 A man may not marry his brother's
or his sister's daughter, or even his or her granddaughter,
though she is in the fourth degree; for when we may not marry
a person's daughter, we may not marry the granddaughter either.