1 The leading division of all actions whatsoever, whether tried before a judge or a referee, is into two kinds, real and personal; that is to say, the defendant is either under a contractual or delictal obligation to the plaintiff, in which case the action is personal, and the plaintiff's contention is that the defendant ought to convey something to, or do something for him, or of a similar nature; or else, though there is no legal obligation between the parties, the plaintiff asserts a ground of action against some one else relating to some thing, in which case the action is real. Thus, a man may be in possession of some corporeal thing, in which Titius claims a right of property, and which the possessor affirms belongs to him; here, if Titius sues for its recovery, the action is real. 2 It is real also if a man asserts that he has a right of usufruct over a landed estate or a house, or a right of going or driving cattle over his neighbour's land, or of drawing water from the same; and so too are the actions relating to urban servitudes, as, for instance, where a man asserts a right to raise his house, to have an uninterrupted prospect, to project some building over his neighbour's land, or to rest the beams of his own house on his neighbour's wall. Conversely, there are actions relating to usufructs, and to rustic and urban servitudes, of a contrary import, which lie at the suit of plaintiffs who deny their opponent's right of usufruct, of going or driving cattle, of drawing water, of raising their house, or having an uninterrupted view, of projecting some building over the plaintiff's land, or of resting the beams of their house in the plaintiff's wall. These actions too are real, but negative, and never occur in disputes as to corporeal things, in which the plaintiff is always the party out of possession; and there is no action by which the possessor can (as plaintiff) deny that the thing in question belongs to his adversary, except in one case only, as to which all requisite information can be gathered from the fuller books of the Digest. 3 The actions which have hitherto been mentioned, and others which resemble them, are either of statutory origin, or at any rate belong to the civil law. There are other actions, however, both real and personal, which the praetor has introduced in virtue of his jurisdiction, and of which it is necessary to give examples. For instance, he will usually, under the circumstances to be mentioned, allow a real action to be brought with a fictitious allegation--namely, that the plaintiff has acquired a title by usucapion where this, in fact, is not the case; or, conversely, he will allow a fictitious plea on the part of the defendant, to the effect that the plaintiff has not acquired such a title where, in point of fact, he has.