It is conceded that the relator's judgment, which he is now seeking to collect, was founded upon municipal obligations of Cape Girardeau county, issued under the authority of an act to facilitate the construction of railroads in the state of Missouri, which took effect March 23, 1868. Laws Mo. 1868, p. 92. The second section of that act is as follows: 'Sec. 2. In r der to meet the payments on account of the subscription to the stock according to its terms, or to pay the interest and principal on any bond which may be issued on account of such subscription, the county court shall from time to time levy and cause to be collected, in the same manner as county taxes, a special tax, which shall be levied on all the real estate lying within the township making the subscription in accordance with the valuation then last made by the county assessor for county purposes.'

It will be observed that the tax authorized by this section of the statute of 1868, under which the bonds were issued, is to be levied on the real estate within the township only, and not upon the personal property, including statements of merchants and manufacturers doing business in the township. But this levy upon personal property and merchants' licenses, in addition to real estate, is authorized by an amendment passed March 10, 1871. 1 Wag. St. 1872, p. 313, § 52. As thus amended, the section reads as follows: 'In order to meet the payments on account of the subscription to the stock according to its terms, or to pay the interest and principal on any bond which may be issued on account of such subscription, the county court shall, from time to time, levy and cause to be collected, in the same manner as county taxes, a special tax, which shall be levied on all the real estate and personal property, including all statements of merchants doing business within said * * * township, * * * lying and being within the township making the subscription, in accordance with the valuation then last made by the county assessor for county purposes,' etc.

That the relator was entitled to a tax levied in pursuance of this amended section, his judgment having been obtained while it was in force, was adjudged in his favor by the circuit court when he obtained his peremptory mandamus against the judges of the county court requiring them to levy the tax, the collection of which he is now seeking to enforce by the present proceeding. The question was also directly adjudged in his favor by this court in the case of Cape Girardeau Co. Court v. Hill, 118 U. S. 68, 6 Sup. Ct. Rep. 951. In that case it was said: 'The township having legally incurred an obligation to pay the bonds in question, it was competent for the legislature at any time to make provision for its being met by taxation upon any kind of property within the township that was subject to taxation for public purposes.'

Having obtained his judgment while that act remained in force, and having obtained by the judgment of the circuit court an actual levy of a tax according to its provisions, his right thereto became thereby vested so as not to be affected by a subsequent repeal of the statute. But on March 8, 1879, the general assembly of the state of Missouri passed an act, found in sections 6798, 6799, and 6800 of the Revised Statutes of Missouri of 1879, which read as follows:

'Sec. 6798. Taxes, how Assessed, Levied, and Collected. The followingnamed taxes shall hereafter be assessed, levied, and collected in the several counties in this state, and only in the manner and not to exceed the rates prescribed by the constitution and laws of this state, viz., the state tax and the tax necessary to pay the funded or bonded debt of the state, the tax for current county expenditures, and for schools.

'Sec. 6799. Procedure, Limitations, and Conditions. No other tax for any purpose shall be assessed, levied, or collected, except under the following limitations and conditions, viz.: The prosecuting attorney or county attorney of any county, upon the request of the county court of such county, which request shall be of record with the proceedings of said court, and such court being first satisfied that there exists a necessity for the assessment, levy, and collection of other taxes than those enumerated and specified in the preceding section, shall present a petition to the circuit court o his county, or to the judge thereof in vacation, setting forth the facts and specifying the reasons why such other tax or taxes should be assessed, levied, and collected; and such circuit court, or judge thereof, upon being satisfied of the necessity for such other tax or taxes, and that the assessment, levy, and collection thereof will not be in conflict with the constitution and laws of this state, shall make an order directed to the county court of such county commanding such court to have assessed, levied and collected such other tax or taxes, and shall enforce such order by mandamus or otherwise.

'Sec. 6800. Assessment, Levy, and Collection not to be Made Except as Provided. Any county court judge, or other county officer in this state, who shall assess, levy, or collect, or who shall attempt to assess, levy, or collect, or cause to be assessed, levied, or collected, any tax or taxes other than those specified and enumerated in section six thousand seven hundred and ninety-eight, without being first ordered so to do by the circuit court of the county, or the judge thereof, in the express manner provided and directed in section six thousand seven $w293 hundred and ninety-nine, shall be guilty of a misdemeanor, and, upon conviction thereof, shall be punished by fine not less than five hundred dollars, and, in addition to such punishment, his office shall become vacant; and the method herein provided for the assessment, levy, and collection of any tax or taxes not enumerated and specified in section six thousand seven hundred and ninety-eight, shall be the only method known to the law whereby such tax or taxes may be assessed or collected, or ordered to be assessed, levied, or collected.'

By these provisions it appears that the state tax and the tax necessary to pay the funded or bonded debt of the state, the tax for the current county expenditures, and for schools, are to be assessed, levied, and collected in the several counties of the state as a matter of positive duty by the county courts of the several counties, according to their previous practice, without the intervention of any other authority. All other taxes, which include the tax sought to be collected in this proceeding, can be assessed, levied, and collected only under the limitations and conditions therein prescribed; that is to say, the county court being first satisfied that there exists a necessity for the assessment, levy, and collection of such other tax, shall request the prosecuting attorney for the county to present a petition to the circuit court of the county, or to the judge thereof in vacation, setting forth the facts, and specifying the reasons why such other tax or taxes should be assessed, levied, and collected. In pursuance of that request the prosecuting attorney is required to present such a petition, and the circuit court, or judge thereof, to whom such petition is presented, shall make an order directed to the county court of such county, commanding such court to have assessed, levied, and collected such tax, 'upon being satisfied of the necessity for such other tax or taxes, and that the assessment, levy, and collection thereof will not be in conflict with the constitution and laws of this state.' Section 6800 provides that any county court judge, or other county officer, who shall assess, levy, or collect, or attempt so to do, or cause to be assessed, levied, or collected, any tax, without being first ordered so to do by the circuit court of the county, in the express manner provided and directed in the preceding section, shall be guilty of a misdemeanor, to be punished on conviction by a fine of not less than $500 and a forfeiture of his office; and it is therein declared that 'the method herein provided for the assessment, levy, and collection of any tax or taxes not enumerated and specified in section 6798, shall be the only method known to the law whereby such tax or taxes may be assessed or collected, or ordered to be assessed, levied, or collet ed.'

It is because of these provisions of the law that the respondent herein, as he sets out in his return, has been restrained by an injunction from the circuit court of Cape Girardeau county from further proceeding in the collection of the tax heretofore levied by the county court by virtue of a writ of mandamus from the circuit court of the United States.

The question presented for our determination is whether, by virtue of this statute of the state, he is justified in his disobedience to the judgment and mandate of the circuit court of the United States. It is well settled by the decisions of this court that 'the remedy subsisting in a state when and where the contract is made and is to be performed, is a part of its obligation, and any subsequent law of the state which so affects that remedy as substantially to impair and lessen the value of the contract is forbidden by the constitution, and is therefore void.' Edwards v. Kearzey, 96 U. S. 595, 607.

It had been previously said, upon a review of the decisions of the court, in Von Hoffman v. City of Quincy, 4 Wall. 535, 553: 'It is competent for the states to change the form of the remedy, or to modify it otherwise as they may see fit, provided no substantial right secured by the contract is thereby impaired. No attempt has been made to fix definitely the line between alterations of the remedy which are to be deemed legitimate and those which, under the form of modifying the remedy, impair substantial rights. Every case must be determined upon its own circumstances. Whenever the result last mentioned is produced, the act is within the prohibition of the constitution. and to that extent void.'

In Bronson v. Kinzie, 1 How. 311, Chief Justice TANEY said: 'It is difficult, perhaps, to draw a line that would be applicable in all cases between legitimate alterations of the remedy and provisions which, in the form of remedy, impair the right. But it is manifest that the obligation of the confract, and the rights of a party under it, may, in effect, be destroyed by denying a remedy altogether, or may be seriously impaired by burdening the proceedings with new conditions and restrictions, so as to make the remedy hardly worth pursuing.'

In Louisiana v. New Orleans, 102 U. S. 203, 206, Mr. Justice FIELD, in the opinion of the court, said: 'The obligation of a contract, in the constitutional sense, is the means provided by law by law by which it can be enforced,—by which the parties can be obliged to perform it. Whatever legislation lessens the efficacy of these means impairs the obligation. If it tend to postpone or retard the enforcement of the contract, the obligation of the latter is to that extent weakened.'

In various forms, but with the same meaning, this rule has been often repeated in subsequent decisions by this court. It is therefore not denied in argument in the present case that section 2 of the act of March 23, 1868, under which the municipal obligations of the relator which had passed into judgment were issued, constitutes a part of the contract to the benefit of which he is entitled. That section, it will be remembered, provides that, to pay the interest and principal of any bond which may be issued under the authority thereof, 'the county court shall from time to time levy and cause to be collected, in the same manner as county taxes, a special tax,' etc.

The precise question, therefore, for present adjudication is whether the provisions for levying and collecting such a tax contained in the sections of the Revised Statutes above quoted, are, in view of the doctrine of this court on that subject, a legal equivalent for the provision contained in the act of March 23, 1868. The affirmative of that proposition is contended for by the plaintiff in error. The argument in support of that position is that the machinery provided for the collection of such a tax in section 6799 is purely formal; that it does not touch the substance of the right to have the tax levieda nd collected, nor does it embarrass and impede it by any unreasonable hinderance or delay. It is said that, according to its terms, under a judgment upon such municipal bonds and coupons in a circuit court of the United States, it would be the duty of the county court to enter of record that it was satisfied of the existence of the necessity for the levy and collection of such a tax, and thereupon to request the prosecuting attorney to file his petition to the circuit court of the county to obtain the proper order therefor; that it would then be the duty of the prosecuting attorney to file such a petition, and that the circuit court, or a judge thereof, on the production of the judgment required to be paid, would be satisfied of the necessity for such tax, and that the assessment, levy, and collection thereof would not be in conflict with the constitution and laws of the state, even although he might be of the opinion that the bonds themselves were not valid according to the laws of the state; and that, accordingly, the order would be made and directed to the county court, commanding that court to have assessed, levied, and collected the tax, the necessity for the collection of which they had already declared upon their own records.

The point of the argument pressed upon us seems to be that the judgment of the circuit court of the United States upon the bonds and coupons would necessarily be conclusive, in the opinion of the county court and of the prosecuting attorney and of the circuit court of the county, upon all matters of law and of fact which otherwise, by this section of the statute, would be committed to the exercise of their judicial discretion; and that, consequently, everything to be done by them under the provisions of that section would thereby become merely ministerial, so that, in case of their refusal to act, they would be subject, at the suit of the judgment creditor, to a proceeding by mandamus to compel them to proceed in the assessment, levy, and collection of the tax to which he was entitled.

But the contract which the relator is entitled to insist upon under the act of March 23, 1868, is that he shall have a special tax for the payment of the principal and interest due him, to be levied from time to time 'in the same manner as county taxes.' It may be admitted that the legislature, from time to time, notwithstanding this provision, might by subsequent legislation change the mode and the means for the assessment, levy, and collection of county taxes, as in its judgment the public interests should require. Any such changes, made in view of public interests, not substantially to the prejudice of public creditors, might be considered, in respect to them, as the legal equivalent for the particular mode in force in 1868, and a fair and reasonable substitute therefor. Ordinarily it would be true that such altered provisions would not be injurious to any private rights, for the creditor would at all times have the guaranty of as prompt and speedy a collection of a tax in satisfaction of his claim as is secured by law for the collection of the revenues of the county most important for the support of its government.

It may therefore be considered as a most material and important part of the contract contained in the second section of the act of March 23, 1868, not, perhaps, that the creditor shall always have a right to have taxes for his benefit collected in the same manner in which county taxes were collectible at that date, but that he shall at least always have the right to a special tax to be levied and collected in the same manner as county taxes at the same time may be levied and collected. In other words, the essential part and value of the contract is that he shall always have a special tax to be collected in a manner as prompt and efficacious as that which shall at the time, when he applies for it, be provided by law for the collection of the general revenue of the county. His contract is not only that he shall hav as good a remedy as that provided by the terms of the contract when made, but that his remedy shall be by means of a tax, in reference to which the levy and collection shall be as efficacious as the state provides for the benefit of its counties, without any discrimination against him.

It is in this vital point that the obligation of the contract with the relator has been impaired by the section of the law under which the respondent seeks to justify his disobedience of the mandate of the circuit court. Those sections provide one mode for the collection of county taxes by the direct action of the county court. They provide another mode for the collection of the special tax for the payment of obligations such as those held by the relator and merged in his judgment. The expressly declare that he shall not be entitled to a tax collected in the same manner as county taxes, but add limitations and conditions which, whatever may have been the legislative motive, compared with the original remedy provided by the law for the satisfaction of his contract, cannot fail seriously to embarrass, hinder, and delay him in the collection of his debt, and which make an express and injurious discrimination against him.

We are referred by counsel for the plaintiff in error to the case of Hawley v. Fairbanks, 108 U. S. 543, 2 Sup. Ct. Rep. 846, as an authority in support of his contention. In that case, however, a peremptory mandamus was a warded to compel the levy and collection of a tax for the payment of a judgment of the circuit court of the United States, notwithstanding an injunction to the contrary issued out of the state court. And it was there held that the judgment of the circuit court of the United States against the municipality was a sufficient warrant and authority to the county clerk to make the assessment of a tax for its payment, notwithstanding the omission of the preliminary certificates of the town clerk and the allowance by the board of auditors of the town, which in other cases to law made necessary to the orderly levy and collection of the tax.

We have also been furnished with the opinion of the supreme court of the state of Missouri, in the case of State v. Judges County Court Cape Girardeau Co., 3 S. W. Rep. 844, (delivered March 21, 1887,) affirming the judgment of the circuit court of Cape Girardeau county, perpetuating the injunction set up in the return of the respondent in this case as an answer to the alternative mandamus. The judge delivering the opinion of the court says: 'It has been ruled by this court that taxes of the nature now in question can only be levied and collected in the manner provided in said section [section 6799,] and that, unless the methods prescribed are pursued, the failure to pursue them, when, as here, they are the conditions essential to the exercise of the power, will render the tax invalid. State v. Hannibal & St. J. R. R., 87 Mo. 236. Here those methods—those conditions precedent were not followed; and hence the county court, having no inherent hower to levy a tax, and deriving its only authority from the state, must of necessity pursue the course in this regard marked out by the sovereign authority,—by its laws.' The court further proceeds to say that the matter is not affected by the mandate of the federal court, in reference to which the opinion proceeds as follows: 'If, as already seen, the county court was powerless to act, except when acting in conformity to express statutory conditions, it was still the duty of the judges to comply with those conditions while yielding obedience to the mandate aforesaid; for outside of those statutory conditions they were utterly powerless to act. Indeed, under section 6800, they were punishable for a misdemeanor in failing to comply with the provisions of section 6799 before levying the tax. It does not stand to reason that their act could be valid, and at the same time punishable as a crime. State v. Garroutte, 67 Mo. 456. f the statutory provisions being discussed were of such a nature as to cut off those who obtained the judgments from enforcing the obligations held by them, then the authorities cited on their behalf might apply. I understand that it is within the power of the state to change the remedy, so long as it does not essentially affect the right embodied in the contract; and that such change, thus made, does not infract the rule that forbids the contract to be impaired.'

The opinion assumes that the remedy for the collection of the tax provided by the sections of the Revised Statutes of Missouri referred to is legally equivalent to that contained in section 2 of the act of March 23, 1868; the differences between them not appearing to have been considered. It also assumes, for that reason, that those provisions of the Revised Statutes are the only laws in force for the collection of such a tax; those in force in 1871, when the judgment of the circuit court was rendered, having been repealed.

For the reasons which we have pointed out, we are unable to concur in the judgment of the supreme court of Missouri, and are constrained to hold that the sections of the Revised Statutes in question impair the obligation of the contract with the relator under the act of March 23, 1868, and as to him are therefore null and void by force of the constitution of the United States; and that the laws of Missouri, for the collection of the tax necessary to pay his judgment, in force at the time when it was rendered, continue to be and are still in force for that purpose. They are the laws of the state which are applicable to his case. When he seeks and obtains the writ of mandamus from the circuit court of the United States for the purpose of levying a tax for the payment of the judgment which it has rendered in his favor, he asks and obtains only the enforcement of the laws of Missouri under which his rights became vested, and which are preserved for his benefit by the constitution of the United States. The question, therefore, is not whether a tax shall be levied in Missouri without the authority of its law, but which of several of its laws are in force and govern the case. Our conclusion is that the statutory provisions relied upon by the respondent in his return to the alternative writ of mandamus do not apply, and do not, therefore, afford the justification which he pleads.

The judgment of the circuit court is accordingly affirmed.