476
CONSTITUTION OF THE U. STATES.
[BOOK III.
over them, because evasions of the law can be prevented more certainly by executing it, while the articles are in its custody. It would not, however, be less an impost or duty on the articles, if it were to be levied on them after they were landed. The policy and consequent practice of levying or securing the duty before, or on entering the port, does not limit the power to that state of things, nor, consequently, the prohibition, unless the true meaning of the clause so confines it. What, then, are "imports?" The lexicons inform us, they are "things imported." If we appeal to usage for the meaning of the word, we shall receive the same answer. They are the articles themselves, which are brought into the country. "A duty on imports," then, is not merely a duty on the act of importation, but is a duty on the thing imported. It is not, taken in its literal sense, confined to a duty levied, while the article is entering the country, but extends to a duty levied after it has entered the country. The succeeding words of the sentence, which limit the prohibition, show the extent, in which it was understood. The limitation is, "except what may be absolutely necessary for executing its inspection laws." Now, the inspection laws, so far as they act upon articles for exportation, are generally executed on land, before the article is put on board the vessel; so far, as they act upon importations, they are generally executed upon articles, which are landed. The tax or duty of inspection, then, is a tax, which is frequently, if not always, paid for service performed on land, while the article is in the bosom of the country. Yet this tax is an exception to the prohibition on the states to lay duties on imports or exports. The exception was made, because the tax would otherwise have been within the prohibition. If
