-In manner and form. A phrase formerly used in pleading. It was the nature of a traverse to deny the matter of fact in the adverse pleading in the manner and form in which it was alleged, and, therefore, to put the opposite party to prove it to be true in manner and form as well as in general effect. The plea of non est factum, and the replication de injuria, were the only negative traverses not pleaded modo et forma. These words were in no case strictly essential, so as to render their omission a cause of demurrer. - Wharton. MODUS.-Custom; manner; means; way. Modus de non decimando non valet. -An agreement not to take tithes avails not. MODUS DECIMANDI.-Is where there exists by custom a particular manner of tithing, i. e. of paying tithes, different from the general rule. This is sometimes a pecuniary compensation, such as twopence an acre for the tithe of land; sometimes it is a compensation in work and labor, as that the parson shall have only the twelfth cock of hay, and not the tenth, in consideration of the owner's making it for him, or the like. (2 Bl. Com. 29; Phillim. Ecc. L. 1502; Stat. 2 and 3 Will. IV. c. 100, fixing the time for claiming a modus by prescription.) Moduses are within the Tithe Commutation Acts, and have probably been commuted in most if not in all cases. See TITHES; DE NON DECIMANDO; COMPOSITION, § 5. Modus et conventio vincunt legem (2 Co. 73): Custom and agreement overrule law. This maxim forms one of the first principles relative to the law of contracts. The exceptions to the rule here laid down are in cases against public policy, morality, &c.