“ The petition alleged that the plaintiffs were owners in fee and entitled to the possession; that the defendants had forcibly taken possession and were wrongfully keeping the plaintiffs out of possession, and that the latter were damaged thereby in a sum named. Nothing more was required to state a good cause of action. ”

“ Diversity of citizenship was not alleged, and, unless the allegations respecting the invalidity, under the legislation of Congress, of the defensive claim attributed to the defendants, operated to bring the case within the jurisdiction of the circuit court, the judgment of dismissal was plainly right. ”