become perceptible till men had begun to adopt a distinct practice in contracting and conveying. It may here be observed that we know enough of ancient Roman law to give some idea of the mode of transformation followed by legal conceptions and by legal phraseology in the infancy of Jurisprudence. The change which they undergo appears to be a change from general to special; or, as we might otherwise express it, the ancient conceptions and the ancient terms are subjected to a process of gradual specialisation. An ancient legal conception corresponds not to one but to several modern conceptions. An ancient technical expression serves to indicate a variety of things which in modern law have separate names allotted to them. If however we take up the history of Jurisprudence at the next stage, we find that the subordinate conceptions have gradually disengaged themselves and that the old general names are giving way to special appellations. The old general conception is not obliterated, but it has ceased to cover more than one or a few of the notions which it first included. So too the old technical name remains, but it discharges only one of the functions which it once performed. We may exemplify this phenomenon in various ways. Patriarchal Power of all sorts appears, for instance, to have been once conceived as identical in character, and it was doubtless distinguished by one name. The Power exercised by the ancestor was the same whether it was exercised over the family or the material property--over flocks, herds, slaves, children, or wife. We cannot be absolutely certain of its old Roman name, but there is very strong reason for believing, from the number of expressions indicating shades of the notion of _power_ into which the word _manus_ enters, that the ancient general term was _manus_. But, when Roman law has advanced a little, both the name and the idea have become specialised. Power is discriminated, both in word and in conception, according to the object over which it is exerted. Exercised over material commodities or slaves, it has become _dominium_--over children, it is _Potestas_--over free persons whose services have been made away to another by their own ancestor, it is _mancipium_--over a wife, it is still _manus_. The old word, it will be perceived, has not altogether fallen into desuetude, but is confined to one very special exercise of the authority it had formerly denoted. This example will enable us to comprehend the nature of the historical alliance between Contracts and Conveyances. There seems to have been one solemn ceremonial at first for all solemn transactions, and its name at Rome appears to have been _nexum_. Precisely the same forms which were in use when a conveyance of property was effected seem to have been employed in the making of a contract. But we have not very far to move onwards before we come to a period at which the notion of a Contract has disengaged itself from the notion of a Conveyance.