"to determine and prescribe what will be the just and reasonable rate or rates, charge or charges, to be thereafter observed in such cases as the maximum to be charged; and what regulations or practice in respect to such transportation is just, fair and reasonable to be thereafter followed." To leave no doubt of the true construction of this section, an examination of the order required to be entered by the commission is conclusive of the meaning and intention of Congress in the enactment of this portion of the fifteenth section. It provides: "And to make an order that the carrier shall cease and desist from such violation to the extent to which the commission finds the same to exist, and shall not thereafter publish, demand, or collect any rate or charge for such transportation in excess of the maximum rate or charge so prescribed." An analysis of this order of the commission which requires it to provide "that the carrier shall cease and desist from such violation, to the extent to which the commission finds the same to exist," recognizes the fact that the rate is an existing rate, is an effective rate, is a rate in full operation, and cannot, therefore, be applied under the provisions of the amendment suggested to the sixth section, as no rate has gone into effect and become operative. The subject we are considering as affected by the proposed amendment and the provisions of the fifteenth section, do not rest upon any principle of the common law, but are purely statutory enactments to carry out a policy in reference to interstate commerce deemed wise by Congress. The construction, therefore, of the statute in this respect cannot be aided by any principles of the common law, and the conclusion as to its meaning must rest entirely upon the intention of the legislature as expressed by the language of the act. If this view of the fifteenth section is correct, the adoption of the amendment to the sixth section would change one of the most effective provisions of the act of June 29, 1906, and which was contended for with such earnestness in its passage through Congress.