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CHAP. IX. the consent of the Parties is more emphatically given than in any other species of agreement. But the term Consensual merely indicates that the Obligation is here annexed at once to the Consensus. The Consensus, or mutual assent of the parties, is the final and crowning ingredient in the Convention, and it is the special characteristic of agreements falling under one of the four heads of Sale, Partnership, Agency, and Hiring, that, as soon as the assent of the parties has supplied this ingredient, there is at once a Contract. The Consensus draws with it the Obligation, performing, in transactions of the sort specified, the exact functions which are discharged, in the other contracts, by the Res or Thing, by the Verba stipulationis, and by the Literæ or written entry in a ledger. Consensual is therefore a term which does not involve the slightest anomaly, but is exactly analogous to Real, Verbal, and Literal.

In the intercourse of life the commonest and most important of all the contracts are unquestionably the four styled Consensual. The larger part of the collective existence of every community is consumed in transactions of buying and selling, of letting and hiring, of alliances between men for purposes of business, of delegation of business from one man to another; and this is no doubt the consideration which led the Romans, as it has led most societies, to relieve these transactions from technical incumbrance, to