Article II. On Onerous Commutative Contracts

Having explained gratuitous contracts and acts, we approach onerous contracts, and first onerous commutative contracts. There are very many onerous contracts, but a perfect knowledge of all of them is not so necessary for the confessor. The principal ones are purchase and sale, letting and hiring. We shall treat them specially, adding, however, by way of a scholion something concerning certain other onerous commutative contracts, or contracts of certain outcome.