A writ formerly granted for freeing and discharging persons from serving on assizes and juries. Fitzh. Nat Brev. 165. Non possessor! inoumbit neoessitas proband! possessiones ad se pertinere. A person in possession is not bound to prove that the possessions belong to him. Broom, Max. 714. Non potest adduei exceptio ejus re! eujus petitur dissolutio. An exception of the same thing whose avoidance is sought cannot be made. Broom, Max. 166. Non potest probari quod probatum nom relevat. 1 Exch. 91, 92. That cannot be proved which, if proved, is Immaterial. Non potest quia sine brevi agero. No one can sue without a writ Fleta, lib. 2, c. 13, $ 4. A fundamental rule of old practice, Nom potest rex gratiam facere cum injuria et damno aliorum. The king cannot confer a favor on one subject which occasions injury and loss to others. 3 Inst 236; Broom, Max. 63. Non potest rex subditum renitcntcm oner are impositiouibus. The king cannot load a subject with Imposition against his consent 2 Inst. 61. Non potest videri desisse habere qui nunquam babuit. He cannot be considered as having ceased to have a thing who never had it Dig. 50, 17, 208.