§ 14. "That the Treasury shall have power, on the recommendation of the Import Duties Advisory Committee, by order to direct from time to time, as respects goods of any class or description which are chargeable, or which it is apprehended will shortly become chargeable, with the general ad valorem duty, that a duty chargeable by reference 687 to weight or other measure of quantity at such rate as may be specified in the order shall be substituted for the general ad valorem duty, notwithstanding that the duty so substituted may be equivalent to a duty of more or less than 10 per cent. of the value of some of the goods falling within that class or description."