Congress then proposed to take up the bills by issuing new bills on the credit of the several states, guaranteed by the United States, not exceeding one-twentieth of the amount of the old issue, the new bills to draw interest and be redeemable in six years. But the scheme failed, and the bills became, during 1780, of so little value that they ceased to circulate and "quietly died," says the historian of the period, "in the hands of their possessors."

And it is within the memory of all of us that during the late rebellion the notes of the United States issued under the legal tender act rose in value in the market as the successes of our arms gave evidence of an early termination of the war, and that they fell in value with every triumph of the Confederate forces. No legislation of congress declaring these notes to be money instead of representatives of money or credit could alter this result one jot or tittle. Men measured their value not by congressional declaration, which could not alter the nature of things, but by the confidence reposed in their ultimate payment.

Without the legal tender provision the notes would have circulated equally well and answered all the purposes of government—the only direct benefit resulting from that provision arising, as already stated, from the ability it conferred upon unscrupulous debtors to discharge with them previous obligations. The notes of state banks circulated without possessing that quality and supplied a currency for the people just so long as confidence in the ability of the banks to redeem the notes continued. The notes issued by the national bank associations during the war, under the authority of congress, amounting to $300,000,000, which were never made a legal tender, circulated equally well with the notes of the United States. Neither their utility nor their circulation was diminished in any degree by the absence of a legal tender quality. They rose and fell in the market under the same influences and precisely to the same extent as the notes of the United States, which possessed this quality.

It is foreign, however, to my argument, to discuss the utility of the legal tender clause. The utility of a measure is not the subject of judicial cognizance, nor, as already intimated, the test of its constitutionality. But the relation of the measure as a means to an end, authorized by the constitution, is a subject of such cognizance, and the test of its constitutionality, when it is not prohibited by any specific provision of that instrument, and is consistent with its letter and spirit. "The degree," said Hamilton, "in which a measure is necessary, can never be a test of the legal right to adopt it. That must be a matter of opinion, and can only be a test of expediency. The relation between the means and the end, between the nature of a means employed toward the execution of the power and the object of that power, must be the criterion of unconstitutionality; not the more or less of necessity or utility."

If this were not so, if congress could not only exercise, as it undoubtedly may, unrestricted liberty of choice among the means which are appropriate and plainly adapted to the execution of an express power, but could also judge, without its conclusions being subject to question in cases involving private rights, what means are thus appropriate and adapted, our government would be, not what it was intended to be, one of limited, but one of unlimited powers.

Of course congress must inquire in the first instance, and determine for itself not only the expediency, but the fitness to the end intended, of every measure adopted by its legislation. But the power of this tribunal to revise these determinations in cases involving private rights has been uniformly asserted, since the formation of the constitution to this day, by the ablest statesmen and jurists of the country.

I have thus dwelt at length upon the clause of the constitution investing congress with the power to borrow money on the credit of the United States, because it is under that power that the notes of the United States were issued, and it is upon the supposed enhanced value which the quality of legal tender gives to such notes, as the means of borrowing, that the validity and constitutionality of the provision annexing this quality are founded. It is true that, in the arguments of counsel, and in the several opinions of different state courts, to which our attention has been called, and in the dissenting opinion in Hepburn v. Griswold, reference is also made to other powers possessed by congress, particularly to declare war, to suppress insurrection, to raise and support armies, and to provide and maintain a navy; all of which were called into exercise and severely taxed at the time the legal tender act was passed. But it is evident that the notes have no relation to these powers, or to any other powers of congress, except as they furnish a convenient means for raising money for their execution. The existence of the war only increased the urgency of the government for funds. It did not add to its powers to raise such funds, or change, in any respect, the nature of those powers or the transactions which they authorized. If the power to engraft the quality of legal tender upon the notes existed at all with congress, the occasion, the extent, and the purpose of its exercise were mere matters of legislative discretion; and the power may be equally exerted when a loan is made to meet the ordinary expenses of government in time of peace, as when vast sums are needed to raise armies and provide navies in time of war. The wants of the government can never be the measure of its powers.

The constitution has specifically designated the means by which funds can be raised for the uses of the government, either in war or peace. These are taxation, borrowing, coining, and the sale of its public property. Congress is empowered to levy and collect taxes, duties, imposts, and excises, to any extent which the public necessities may require. Its power to borrow is equally unlimited. It can convert any bullion it may possess into coin, and it can dispose of the public lands and other property of the United States, or any part of such property. The designation of these means exhausts the powers of congress on the subject of raising money. The designation of the means is a negation of all others, for the designation would be unnecessary and absurd if the use of any and all means were permissible without it. These means exclude a resort to forced loans, and to any compulsory interference with the property of third persons, except by regular taxation in one of the forms mentioned.

But this is not all. The power to "coin money" is, in my judgment, inconsistent with and repugnant to the existence of a power to make anything but coin a legal tender. To coin money is to mould metallic substances having intrinsic value into certain forms convenient for commerce, and to impress them with the stamp of the government indicating their value. Coins are pieces of metal, of definite weight and value, thus stamped by national authority. Such is the natural import of the terms, "to coin money," and "coin;" and if there were any doubt that this is their meaning in the constitution, it would be removed by the language which immediately follows the grant of the "power to coin," authorizing congress to regulate the value of the money thus coined, and also "of foreign coin," and by the distinction made in other clauses between coin and the obligations of the general government and of the several states.

The power of regulation conferred is the power to determine the weight and purity of the several coins struck, and their consequent relation to the monetary unit which might be established by the authority of the government—a power which can be exercised with reference to the metallic coins of foreign countries, but which is incapable of execution with reference to their obligations or securities.