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ment that the plaintiff was a Roman citizen, when in truth he was a foreigner. The object of these "fictiones" was, of course, to give jurisdiction, and they therefore strongly resembled the allegations in the writs of the English Queen's Bench and Exchequer, by which those Courts contrived to usurp the jurisdiction of the Common Pleas:—the allegation that the defendant was in custody of the king's marshal, or that the plaintiff was the king's debtor, and could not pay his debt by reason of the defendant's default. But I now employ the expression "Legal Fiction" to signify any assumption which conceals, or affects to conceal, the fact that a rule of law has undergone alteration, its letter remaining unchanged, its operation being modified. The words, therefore, include the instances of fictions which I have cited from the English and Roman law, but they embrace much more, for I should speak both of the English Case-law and of the Roman Responsa Prudentum as resting on fictions. Both these examples will be examined presently. The fact is in both cases that the law has been wholly changed; the fiction is that it remains what it always was. It is not difficult to understand why fictions in all their forms are particularly congenial to the infancy of society. They satisfy the desire for improvement, which is not quite wanting, at the same time that they do not offend the superstitious disrelish for change which is