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CHAP. IX. law must have led them to look with especial favour on the Consensual Contracts and on those Pacts or Conventions of which the Consensual Contracts were only particular instances; but they did not at once venture on extending to all Conventions the liberty of the Consensual Contracts. They took advantage of that special superintendence over procedure which had been confided to them since the first beginnings of Roman law, and, while they still declined to permit a suit to be launched which was not based on a formal contract, they gave full play to their new theory of agreement in directing the ulterior stages of the proceeding. But, when they had proceeded thus far, it was inevitable that they should proceed farther. The revolution of the ancient law of Contract was consummated when the Prætor of some one year announced in his Edict that he would grant equitable actions upon Pacts which had never been matured at all into Contracts, provided only that the Pacts in question had been founded on a consideration (causa). Pacts of this sort are always enforced under the advanced Roman jurisprudence. The principle is merely the principle of the Consensual Contract carried to its proper consequence; and, in fact, if the technical language of the Romans had been as plastic as their legal theories, these Pacts enforced by the Prætor would have been styled new Contracts, new Consensual Contracts. Legal phraseology is,