Joseph P. Bradley, Parkersburg Ohio River Transp Company v…
“ The Port-wardens, 12 How. 319:'The power to regulate commerce embraces a vast field, containing not only many, but exceedingly various subjects, quite unlike in their nature; some imperatively demanding a single uniform rule, operating equally on the commerce of the United States in every port; and some, like the subject now in question, [which was pilotage] , as imperatively demanding that diversity which alone can meet the local necessities of navigation. ”
