The applicability of Congress's power to the agents and instruments of commerce is implied in Marshall's opinion in Gibbons _v._ Ogden,[339] where the waters of the State of New York in their quality as highways of interstate and foreign transportation are held to be governed by the overruling power of Congress. Likewise, the same opinion recognizes that in "the progress of things," new and other instruments of commerce will make their appearance. When the Licensing Act of 1793 was passed, the only craft to which it could apply were sailing vessels, but it and the power by which it was enacted were, Marshall asserted, indifferent to the "principle" by which vessels were moved. Its provisions therefore reached steam vessels as well. A little over half a century later the principle embodied in this holding was given its classic expression in the opinion of Chief Justice Waite in the case of the Pensacola Telegraph Co. _v._ Western Union Co.,[340] a case closely paralleling Gibbons _v._ Ogden in other respects also. The passage alluded to reads as follows: "The powers thus granted are not confined to the instrumentalities of commerce, or the postal service known or in use when the Constitution was adopted, but they keep pace with the progress of the country, and adapt themselves to the new developments of times and circumstances. They extend from the horse with its rider to the stage-coach, from the sailing-vessel to the steamboat, from the coach and the steamboat to the railroad, and from the railroad to the telegraph, as these new agencies are successively brought into use to meet the demands of increasing population and wealth. They were intended for the government of the business to which they relate, at all times and under all circumstances. As they were intrusted to the general government for the good of the nation, it is not only the right, but the duty, of Congress to see to it that intercourse among the States and the transmission of intelligence are not obstructed or unnecessarily encumbered by State legislation."[341] The Radio Act of 1927 whereby "all forms of interstate and foreign radio transmissions within the United States, its Territories and possessions" were brought under national control, affords another illustration. Thanks to the foregoing doctrine the measure met no serious constitutional challenge either on the floors of Congress or in the Courts.[342] Congressional Regulation of Waterways NAVIGATION