JUS INCOGNITUM. An unknown law. This term is applied by the civilians to
obsolete laws, which, as Bacon truly observes, are unjust, for the law to be
just must give warning before it strikes. Bac. Aphor. 8, s. 1: Bowy. Mod.
Civ. Law, 33. But until it has become obsolete no custom can prevail against
it. Vide Obsolete.