Pleas in bar deny that the plaintiff has any cause of action., 1 Chitty, Pl. 407; Co. Lit. 303 b. They either conclude the plaintiff by matter of estoppel, show that he never had any cause of action, or, ad- mitting that he had, insist that it is de- termined by some subsequent matter. Steph. Pl. And. ed. 448; Britt. 92 § 190. They either deny all or some essential part of the averments in the declaration, in which case they are said to traverse it, or, admitting them to be true, allege new facts which obviate and repel their legal effect, in which case they are said to confess and avoid; Steph. Pl. And. ed. 146. The term is often used in a restricted sense to denote what are with propriety called special pleas in bar. These pleas are of two kinds; the general issue, and special pleas in bar. The general issue denies or takes issue upon all the material allegations of the declara- tion, thus compelling the plaintiff to prove all of them that are essential to support his action. There is, however, a plea to the action which is not strictly either a general issue or a special plea in bar, and which is called a special issue, which denies only some particular part of the declaration which goes to the gist of the action. It thus, on the one hand, denies less than does the general issue, and, on the other hand, is distinguished from a "special plea in bar" in this.-that the lat- ter universally advances new matter, upon which the defendant relies for his defence, which a special issue never does; it simply denies. Lawes, Pl. 110, 145; Co. Litt. 126 a; Gould, Pl. 5th ed. ch ii. § 38, ch. vi. § 8. The matter which ought to be so pleaded is now very generally given in evidence under the general issue. 1 Chitty, Pl. 415. A plea which merely amounts to the general issue, though not such in form, is bad; 84 Md. 414. Special pleas in bar admit the facts al- leged in the declaration, but avoid the ac- tion by matter which the plaintiff would not be bound to prove or dispute in the first instance on the general issue. Ld. Raym. 88. They are very various, accord- ing to the circumstances of the defendant's case: as, in personal action the defendant may plead any special matter in denial, avoidance, discharge, excuse, or justifica- tion of the matter alleged in the declara- tion, which destroys or bars the plaintiff's action; or he may plead any matter which estops or precludes him from averring or insisting on any matter relied upon by the plaintiff in his declaration. The latter sort of pleas are called pleas in estoppel. In real action, the tenant may plead any mat- ter which destroys and bars the demand- ant's title; as, a general release; Steph. Pl. 115. The general qualities of a plea in bar are -first, that it be adapted to the nature and form of the action, and also conformable to the count. Co. Litt. 303 a; 285 b; Bac. Abr. Pleas (I); Rolle 216. Second, that it answers all it assumes to answer, and no more. Co. Litt. 303 a; Com. Dig. Pleader (E 1, 36); 1 Saund. 28; 2 B. & P. 427. Third, in the case of a special plea, that it confess and admit the fact. 3 Term 298; 1 Saund. 28, 14; 10 Johns. 289. Fourth, that it be single. Co. Litt. 307; Bac. Abr. Pleas (K 1, 2); 2 Saund. 49, 50. Fifth, that it be certain. Com. Dig. Pleader (E 5-11, C 41). See CERTAINTY; PLEADING. Sixth, it must be direct, positive, and not argu- mentative. See 6 Cra. 126; 9 Johns. 313. Seventh, it must be capable of trial. Eighth, it must be true and capable of proof. The parts of a plea are-first, the title of the court. Second, the title of the term. Third, the names of the parties in the margin. These, however, do not constitute any substantial part of the plea. The sur- names only are usually inserted, and that of the defendant precedes the plaintiff's: as, "Roe v. Doe." Fourth, the commence- ment, which includes the statement of the name of the defendant, the appearance, the defence, see DEFENCE, the actio non, See ACTIO NON. Fifth, the body, which may contain the inducement, the protes- tation, see PROTESTATION, ground of de- fence, quæ est eadem, the traverse. Sixth, the conclusion. Dilatory pleas go to destroy the partic- ular action, but do not affect the right of action in the plaintiff, and hence delay the decision of the cause upon its merits. Gould, Pl. ch. ii. § 33. This class includes pleas to the jurisdiction, to the disability of the parties, and all pleas in abatement. All dilatory pleas must be pleaded with the greatest certainty, must contain a dis- tinct, clear, and positive averment of all material facts, and must in general, enable