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326 to an understanding in each case; but, if they went no further, they were not obliged to one another, and could not compel performance or ask redress for a breach of faith. But let them comply with certain prescribed formalities, and the Contract was immediately complete, taking its name from the particular form which it had suited them to adopt. The exceptions to this practice will be noticed presently.

I have enumerated the four Contracts in their historical order, which order, however, the Roman Institutional writers did not invariably follow. There can be no doubt that the Verbal Contract was the most ancient of the four, and that it is the eldest known descendant of the primitive Nexum. Several species of Verbal Contract were anciently in use, but the most important of all, and the only one treated of by our authorities, was effected by means of a stipulation, that is, a Question and Answer; a question addressed by the person who exacted the promise, and an answer given by the person who made it. This question and answer constituted the additional ingredient which, as I have just explained, was demanded by the primitive notion over and above the mere agreement of the persons interested. They formed the agency by which the Obligation was annexed. The old Nexum has now bequeathed to maturer jurisprudence first of all the conception of a chain uniting the contracting parties, and this has become the