In stating the rule that the possession of land necessary to give rise to a title by prescription must be a ” contentious ” one, it is meant that it must be based on opposition to the title of the rival claimant (not in recognition thereof or subordination thereto) and that the opposition must be based on good grounds, or such as might be made the subject of litigation . Railroad Co. v. McFarlan, 43 N. J. Law, 621.