2. Non tenure is either a plea in bar or a plea in abatement. 14 Mass. 239; but see 11 Mass. 216. It is in bar, when the plea goes to the tenure, as when the tenant denies that he holds of the defendant, and says he holds of some other person, But when the plea goes to the tenancy of the land, as when the defendant pleads that be is not the tenant of the land, it is in abate, ment only. Id.; Bac. Ab. Pleas, &c., I 9.