_ I concur in the conclusion reached by _ Judge WARD, because I think the case a doubtful one in which it is appropriate that this court should follow the decisions of the coordinate tribunals of the Seventh and Eighth circuits. Mast Foos & Company v. Stover Manufacturing Company, 177 U. S. 485, 488 20 Sup. Ct. 708, 44 L. Ed. 856.