The opinion of the court was delivered by

This was an action to recover the amount of certain port charges imposed upon the schooner “ Marcus Edwards ” by the plaintiff, by virtue of authority conferred upon said board by an act of the legislature of this State of December 24th, 1880, (17 Slat. 398,) as amended by act of December 20th, 1881, (17 Stat. 604.) This vessel was admitted to be an American vessel, owned by citizens of States of the United States other than the State of South Carolina, duly licensed for the coasting trade, and engaged in commerce and navigation between the several States of the United States. The fees or charges fixed by the board were to be “ charged upon all vessels arriving at this port,” [Charleston, South Carolina,] and the amount of such fees or charges was to be determined by “the length over all ” of the vessel, according to a certain classification fixed by the board, the rate in the ease under consideration being five cents “ per foot of length over all.”

It will be observed that the charge was to be exacted from “all vessels arriving at this port,” and that there is no intimation that such charge was to be made as a compensation for any services rendered said vessel, but, on the contrary, it appears from the terms of the act that the said board was “ invested with full power and authority to levy and collect from all vessels entering into and trading with the port of Charleston, such fees *319and harbor or port charges, not inconsistent with law, as, in their discretion, may be necessary to pay the harbor master and port wardens for the services required of them, and to pay the necessary expenses attendant upon the execution of the duties devolved upon the said board under this act.”

It is conceded that the “Marcus Edwards” did enter the port of .Charleston, and that demand was duly made for the charges as fixed by the resolution of the board, which was not complied with, but there was no evidence that any service was rendered such vessel for which such charges were demanded as compensation. The appellants contend that the charges thus demanded of this vessel are expressly prohibited by certain provisions of the constitution of the United States. The clauses of the constitution relied upon are as follows: “ Congress shall have power to regulate commerce with foreign nations and among the several States.” Art. I., § 8. “No State shall, without the consent of Congress, lay any imposts or duties on imports or exports, except what may be absolutely necessary for executing its inspection laws. No State shall, without the consent of Congress, levy any duties on tonnage.” Art. I., § 10. So that the question for us to determine is whether such charges as this now under consideration are prohibited by these constitutional provisions.

This being a question arising under the constitution of the United States, it is proper that we should look to and be governed by the decisions of that tribunal which has been invested with final jurisdiction of such questions — the Supreme Court of the United States. That court has had before it, upon numerous occasions, questions similar to the one now under consideration, and we think that the principles upon which the decision of the question depends have been fully settled. In Steamship Co. v. Port Wardens, 6 Wall. 31, the constitutionality of a statute of Louisiana, which provided that the master and wardens of the port of New Orleans should be entitled to demand and receive, in addition to other fees, the sum of five dollars, whether called on to perform any service or not, from every vessel arriving in that port, was brought in question. The court held the statute to be in violation of the constitution of the United *320States, as being not only a regulation of commerce, but, also, an attempt to impose a duty on tonnage.

Chase, C. J., in delivering the opinion of the court, used this language: “ We think, also, that the tax imposed by the act of Louisiana is, in the fair sense of the word, a duty on tonnage. In the most obvious and general sense, it is true, these words describe a duty proportioned to the tonnage of the vessel; a certain rate on each ton. But, it seems plain that, taken in this restricted sense, the constitutional provision would not fully accomplish its intent. The general prohibition upon the States against levying duties on imports or exports would have been ineffectual if it had not been extended to duties on the ships, which serve as the vehicles of conveyance. This extension was doubtless intended by the prohibition of any duty of tonnage. It was not only a pro rata tax which was prohibited, but any duty on the ship, whether a fixed sum upon its whole tonnage, or a sum to be ascertained by comparing the amount of tonnage with the rate of duty.”

From this view of the constitutional provision, we conclude that the proper construction is that it was designed to forbid the levying of any tax upon a vessel as such, whether the amount of such tax was to be ascertained by reference to the tonnage capacity of the vessel, or by any other mode of measurement. This case has been fully recognized in a number of subsequent cases. See State Tonnage Tax Cases, 12 Wall. 218; Cannon v. New Orlean's, 20 Id. 581; Inman Steamship Co. v. Tinker, 94 U. S. 245; Packet Co, v. Keokuk, 95 U. S. 86. That it is wholly immaterial whether the amount of the tax is to be ascertained by reference to the tonnage of the vessel eo nomine, or in some other way, is fully shown by the fact that the Supreme Court of the United States has, in several cases, held that a charge imposed upon a vessel, even though measured by its tonnage eo nomine, is not in violation of the constitution of the United States where the charge is made as a compensation for services rendered such vessel; as, for example, a charge for the use of a wharf owned by a municipal corporation, even though the amount of such charge should, in express terms, be measured by the tonnage of the vessel, because that is a matter resting in contract, and is the *321■exercise of a mere property right, and not an exercise of sovereign authority. See Cannon v. New Orleans, supra; Packet Co. v. Keokuk, supra; Packet Co. v. St. Louis, 100 U. S. 423; Vicksburg v. Tobin, 100 U. S. 430; Packet Co. v Catlettsburg, 105 U. S. 559.

But where, as in the case of Inman Steamship Co. v. Tinker, 94 U. S. 238, the legislature of New York undertook to pass an act requiring all ships or vessels, with certain exceptions, entering the port of New York, or loading or unloading, or making fast to any wharf therein, to pay a certain percentage per ton, the act was held unconstitutional, not because the amount to be paid was to be measured by the tonnage of the vessel, but because the charge was exacted for simply entering the port, and not for any service rendered. As was said in the opinion of the court: “The name is immaterial; it is the substance we are to consider.” And again: “The tax imposed is not merely a mode of measuring the compensation to be paid. The answer to this suggestion is that it is exacted where there is nothing to be paid for.” In Peete v. Morgan, 19 Wall. 581, it was held that a State cannot, in order to defray the expenses of her quarantine regulations, impose a tonnage tax on vessels owned in foreign ports and entering her harbors in pursuit of commerce.

In Alexander v. Railroad Company, 3 Strobh. 594, recognized and approved in State v. City Council of Charleston, 4 Rich. 288, the Court of Errors of this State held that an ordinance of the city council of Charleston, providing that certain vessels arriving in the port of Charleston should pay to the harbor master one cent per ton, once in every three months, was a tonnage duty, and as such prohibited by the constitution of the United States. The court, manifestly, did not base its opinion upon the fact that the amount of the charge was to be measured by the tonnage of the vessel, for O’Neall, J., in delivering the opinion of the court, used this language: “ But, it is said, the imposition of tonnage in this case is merely a mode by which the plaintiff is to ascertain his fees; and it is so called in the ordinance; *' the above fees/ is its language. I should think there would be great force in this view if it were so that the harbor master rendered any *322service for the defendant. * * * For, in such a case, although the letter of the constitution might be violated, yet its true meaning would be untouched.” This shows that Judge O’Neall took the same view which was subsequently adopted by the Supreme Court of the United States and acted upon in several cases above cited; that where the charge is for service rendered it is wholly immaterial whether the amount of compensation is to be measured by the tonnage of the vessel eo nomine, or b.y any other mode of measurement, as courts look to the substance and not merely to the form of words. It is clear that the court in the Alexander case did not rest its conclusion upon the fact that the charge was imposed in express terms upon the tonnage of the vessel, but upon the fact that the charge was imposed, not for any service rendered, but simply for entering the port, and that it was a tax or duty and not merely a charge for compensation for services rendered. In the same case Judge O’Neall goes on to say: “The distinction between a tax or duty and fees or charges is, that the former is imposed by the sovereign authority without any regard to a corresponding and equivalent benefit or advantage; the latter proceed upon the quid pro quo, and unless service be rendered nothing is to be paid.”

Looking at the case now before the court in the light of these authoritiesj we do not see how it is possible to resist the conclusion that the charge in question is a violation of the constitution of the United States. It was not a charge for any service rendered, for none was rendered, but, as said by Swayne, J., in Packet Co. v. Keokuk, supra: “ It was a sovereign exaction, not a charge for compensation.” It was imposed by the sovereign authority, acting through the agency delegated for that purpose, without any regard to a corresponding equivalent benefit or advantage, and it was, therefore, a tax or duty and not fees or charges. Every vessel, upon entering the port, was liable to pay such charges whether it received any service or not. Its manifest object was to provide the means of paying the officers of the State and the expenses incident to the performance of their duties, and cannot be regarded as anything more or less than as a tax to raise a revenue for that purpose; and we see no reason why, with just as much reason, the State might not *323levy a similar contribution upon every vessel entering the port of Charleston, for the purpose of contributing to the means necessary to pay the police who are charged with the duty of preserving order on the wharves as well as in other parts of the city; and this no one would contend for.

If, as was held in Peete v. Morgan, supra, the State cannot impose such a tax for the purpose of defraying the expenses of her quarantine regulation — a matter in which all vessels entering a port are interested — it is not easy to perceive how the authority to impose such a tax for the purpose of defraying the expenses of its harbor commission could be sustained. The fact that the amount of the charge in the case now in hand was not to be ascertained by reference to the tonnage of the vessel, but was to be measured by another mode — “ the length over all,” which, it seems, is not one of the elements to be considered in calculating the tonnage of a vessel under the rule prescribed by section 4153, Revised Statutes of the United States — cannot, as we have seen, affect the question. To give the word of the constitution such a narrow and restricted sense would not fully accomplish its intent. As said by Mr. Chief Justice Chase, in Steamship Co. v. Port Wardens, supra: “ It was not only a pro rata tax which was prohibited, but any duty on the ship, whether a fixed sum upon its whole tonnage, or a sum to be ascertained by comparing the amount of tonnage with the rate of duty ;” or by any other mode of measurement, we may add, as a necessary consequence of the language quoted.

The judgment of this court is that the judgment of the Circuit Court be reversed.