In Cargill Co. v. Minnesota, 180 U.S. 452, 470 (1901), the requirement of a state license for grain warehouses on railroad rights of way was found to be not inconsistent with the power of the Congress, although the warehouse company purchased the grain, handled in or shipped from its warehouse, for the purpose of transporting it as its property to its terminal elevators in Wisconsin and Illinois and thence to other points in the eastern States. Id., p. 462. The Court thus stated the reasons for this conclusion: "The statute puts no obstacle in the way of the purchase by the defendant company of grain in the State or the shipment out of the State of such grain as it purchased. The license has reference only to the business of the defendant at its elevator and warehouse. The statute only requires a license in respect of business conducted at an established warehouse in the State between the defendant and the sellers of grain. . . . In no real or substantial sense is such commerce obstructed by the requirement of a license."