assumed in disputes to which the parties were either foreigners or a native and a foreigner. The assumption of such a jurisdiction brought with it the immediate necessity of discovering some principles on which the questions to be adjudicated upon could be settled, and the principles applied to this object by the Roman lawyers were eminently characteristic of the time. They refused, as I have said before, to decide the new Cases by pure Roman Civil Law. They refused, no doubt because it seemed to involve some kind of degradation, to apply the law of the particular State from which the foreign litigant came. The expedient to which they resorted was that of selecting the rules of law common to Rome and to the different Italian communities in which the immigrants were born. In other words, they set themselves to form a system answering to the primitive and literal meaning of Jus Gentium, that is, Law common to all Nations. Jus Gentium was, in fact, the sum of the common ingredients in the customs of the old Italian tribes, for they were all the nations whom the Romans had the means of observing, and who sent successive swarms of immigrants to Roman soil. Whenever a particular usage was seen to be practised by a large number of separate races in common it was set down as part of the Law common to all Nations, or Jus Gentium. Thus, although the conveyance of property was certainly accompanied by very different forms in
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