In gathering up the goods of producers the car-load is the common unit, and yet an iron-bound rule in a national statute touching the commerce by rail of 100,000 miles of road, comprehending movements of freight where grain by theelevatorful, coal by the output of a mine, wood by the acre, or sand by the hill, might work inconvenience where the exception would be sanctioned if no monopoly was created against the smaller car-load dealer.
