Latin
Ancient Law
Roman Law and Society, Useful Links to Roman Law Materials. 2.1.395
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We now reach the fourth class, or Consensual Contracts, the most interesting and important of all. Four specified Contracts were distinguished by this name: Mandatum, i. e. Commission or Agency; Societas or Partnership; Emtio Venditio or Sale; and Locatio Conductio or Letting and Hiring. A few pages ago, after stating that a Contract consisted of a Pact or Convention to which an Obligation had been superadded, I spoke of certain acts or formalities by which the law permitted the Obligation to be attracted to the Pact. I used this language on account of the advantage of a general expression, but it is not strictly correct unless it be understood to include the negative as well as the positive. For, in truth, the peculiarity of these Consensual Contracts is that no formalities are required to create them out of the Pact. Much that is indefensible, and much more that is obscure, has been written about the Consensual Contracts, and it has even been asserted that in them 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 Literae 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.