We have next to examine the nature of exceptions. Exceptions are intended for the protection of the defendant, who is often in this position, that though the plaintiff's case is a good one in the abstract, yet as against him, the particular defendant, his contention is inequitable.

1 For instance, if you are induced by duress, fraud, or mistake to promise Titius by stipulation what you did not owe him, it is clear that by the civil law you are bound, and that the action on your promise is well grounded; yet it is inequitable that you should be condemned, and therefore in order to defeat the action you are allowed to plead the exception of duress, or of fraud, or one framed to suit the circumstances of the cases.

2 So too, if, as a preliminary to an advance of money, one stipulates from you for its repayment, and then never advances it after all, it is clear that he can sue you for the money, and you are bound by your promise to give it; but it would be iniquitous that you should be compelled to fulfil such an engagement, and therefore you are permitted to defend yourself by the exception that the money, in point of fact, was never advanced. The time within which this exception can be pleaded, as we remarked in a former Book, has been shortened by our constitution.

3 Again, if a creditor agrees with his debtor not to sue for a debt, the latter still remains bound, because an obligation cannot be extinguished by a bare agreement; accordingly, the creditor can validly bring against him a personal action claiming payment of the debt, though, as it would be inequitable that he should be condemned in the face of the agreement not to sue, he may defend himself by pleading such agreement in the form of an exception.

4 Similarly, if at his creditor's challenge a debtor affirms on oath that he is not under an obligation to convey, he still remains bound; but as it would be unfair to examine whether he has perjured himself, he can, on being sued, set up the defence that he has sworn to the nonexistence of the debt. In real actions, too, exceptions are equally necessary; thus, if on the plaintiff's challenge the defendant swears that the property is his, there is nothing to prevent the former from persisting in his action; but it would be unfair to condemn the defendant, even though the plaintiff's contention that the property is his be well founded.

5 Again, an obligation still subsists even after judgement in an action, real or personal, in which you have been defendent, so that in strict law you may be sued again on the same ground of action; but you can effectually meet the claim by pleading the previous judgement.

6 These examples will have been sufficient to illustrate our meaning; the multitude and variety of the cases in which exceptions are necessary may be learnt by reference to the larger work of the Digest or Pandects.

7 Some exceptions derive their force from statutes or enactments equivalent to statutes, others from the jurisdiction of the praetor;

8 and some are said to be perpetual or peremptory, others to be temporary or dilatory.

9 Perpetual or peremptory exceptions are obstructions of unlimited duration, which practically destroy the plaintiff's ground of action, such as the exceptions of fraud, intimidation, and agreement never to sue.

10 Temporary or dilatory exceptions are merely temporary obstructions, their only effect being to postpone for a while the plaintiff's right to sue; for example, the plea of an agreement not to sue for a certain time, say, five years; for at the end of that time the plaintiff can effectually pursue his remedy. Consequently persons who would like to sue before the expiration of the time, but are prevented by the plea of an agreement to the contrary, or something similar, ought to postpone their action till the time specified has elapsed; and it is on this account that such exceptions are called dilatory. If a plaintiff brought his action before the time had expired, and was met by the exception, this would debar him from all success in those proceedings, and formerly he was unable to sue again, owing to his having rashly brought the matter into court, whereby he consumed his right of action, and lost all chance of recovering what was his due. Such unbending rules, however, we do not at the present day approve. Plaintiffs who venture to commence an action before the time agreed upon, or before the obligation is yet actionable, we subject to the constitution of Zeno, which that most sacred legislator enacted as to overclaims in respect of time; whereby, if the plaintiff does not observe the stay which he has voluntarily granted, or which is implied in the very nature of the action, the time during which he ought to have postponed his action shall be doubled, and at its termination the defendant shall not be suable until he has been reimbursed for all expenses hitherto incurred. So heavy a penalty it is hoped will induce plaintiffs in no case to sue until they are entitled.

11 Moreover, some personal incapacities produce dilatory exceptions, such as those relating to agency, supposing that a party wishes to be represented in an action by a soldier or a woman; for soldiers may not act as attorneys in litigation even on behalf of such near relatives as a father, mother, or wife, not even in virtue of an imperial rescript, though they may attend to their own affairs without committing a breach of discipline. We have sanctioned the abolition of those exceptions, by which the appointment of an attorney was formerly opposed on account of the infamy of either attorney or principal, because we found that they no longer were met with in actual practice, and to prevent the trial of the real issue being delayed by disputes as to their admissibility and operation.