In the next place we must consider matrimony absolutely; and here we must treat: (1) Of the betrothal; (2) Of the nature of matrimony; (3) Of its efficient cause, namely the consent; (4) Of its blessings; (5) Of the impediments thereto; (6) Of second marriages; (7) Of certain things annexed to marriage.

Under the first head there are three points of inquiry:

(1) What is the betrothal?

• (2) Who can contract a betrothal?
• (3) Whether a betrothal can be canceled?