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278 called a Mancipium or Mancipation; but it was not probably till much later that they received the distinctive appellation of Res Mancipi, "Things which require a Mancipation." By their side there may have existed or grown up a class of objects, for which it was not worth while to insist upon the full ceremony of Mancipation. It would be enough if, in transferring these last from owner to owner, a part only of the ordinary formalities were proceeded with, namely, that actual delivery, physical transfer, or tradition, which is the most obvious index of a change of proprietorship. Such commodities were the Res Nec Mancipi of the ancient jurisprudence, "things which did not require a Mancipation," little prized probably at first, and not often passed from one group of proprietors to another. While, however, the list of the Res Mancipi was irrevocably closed, that of the Res Nec Mancipi admitted of indefinite expansion; and hence every fresh conquest of man over material nature added an item to the Res Nec Mancipi, or effected an improvement in those already recognised. Insensibly, therefore, they mounted to an equality with the Res Mancipi, and the impression of an intrinsic inferiority being thus dissipated, men began to observe the manifold advantages of the simple formality which accompanied their transfer over the more intricate and more venerable ceremonial. Two of the agents of legal amelioration, Fictions and Equity, were assiduously employed by the Roman