Mr. Justice Harlan
delivered the opinion of the court.
This case is here on a question propounded under the authority of the Judiciary Act of March 3, 1891, relating to the jurisdiction of the courts of the United States. 26 Stat. 826, c. 517, § 6. The facts out of which the question arises are substantially as will be now stated.
On the twenty-first day of. November, 1889, the plaintiff Kuhn, a citizen of Ohio, sold and conveyed to Camden all the coal underlying a certain tract of land in West Virginia of which he, Kuhn, was the owner in fee. The deed contained these clauses: “The parties of the first part do grant unto the said Johnson N. Camden all the coal and mining privileges necessary and convenient for the removal of the same, in, upon and under a certain tract or parcel of land situated in the county of Marion, on the waters of the West Fork River, bounded and described as follows, to wit: . . . Together with'the right .to enter upon and under said land and to mine, excavate and remove all .of said coal, and to remove, úpon and under the said lands the coal from and under adjacent, coterminous -and neighboring lands, and also the right to enter upon and under the tract of land hereinbefore described [354]*354and make all necessary structures, roads, ways, excavations, airshafts,’ drains, drainways and openings necessary or convenient for the mining and removal of said coal and the coal from coterminous and neighboring lands to market.”
The present action of trespass on the case was brought January 18th,' 1906. The declaration alleged that the coal covered by the above deed passed to the defendant, the Fairmont Coal Company, a West Virginia corporation, on the-of January, 1906; that the plaintiff Kuhn was entitled of right to have all his surface and other strata overlying the coal süpported in its natural state either by pillars or blocks of coal or by artificial support; that on the-day named the defendant company mined and removed coal from under the land, leaving, however, large blocks or pillars of coal as a means of supporting the overlying surface; that the coal company, disregarding the plaintiff’s rights, did knowingly, willfully and negligently, without making any compensation therefor, or for the damages arising therefrom, mine and remove all of. said blocks and pillars of coal so left, by reason whereof and because of the failure to provide any proper or sufficient artificial or other support for the overlying surface, the plaintiff’s surface land, or a large portion thereof, was caused to fall; and that it was cracked, broken and rent, causing large holes and fissures to appear upon the surface and destroying the water and water courses.
The contract under which the title to the. coal originally passed was executed in West Virginia and the plaintiff’s cause of action arose in that State.
A demurrer to the declaration was sustained by the Circuit Court, an elaborate opinion being delivered by Judge Dayton, Kuhn v. Fairmont Coal Co., 152 Fed. Rep. 1013. The case was then taken upon writ of error to the Circuit Court of Appeals.
It appears from the statement of the case made by the Circuit Court of Appeals that .in the year 1902, after Kuhn’s deed to Camden, one Griffin brought, in a court of West [355]*355Virginia, an action, similar in all respects to the present one, against the Fairmont Coal Company, the successor of Camden. His rights arose from a deed. almost identical with that executed by Kuhn to Camden. That case was ruled .in favor of the Coal Company, and, subsequently, was taken to the Suprefne Court of West Virginia, which announced its opinion therein in November, 1905. A petition for rehearing having been filed, the judgment was stayed. But the petition was overruled March 27, 1906, on which day, after Kuhn’s suit was brought, the decision previously announced in the Griffin case became final under the rules of the Supreme Court of the State. Griffin v. Coal Co., 59 W. Va. 480.
The contention by the Coal Company in the court below was thát as the decision in the Griffin case covered, substantially, the same question as the one here involved) it was the duty, of the Federal - court to afccept that decision as controlling the rights of the present parties, whatever might be its own opinion as to the law applicable to this case. The contention of Kuhn was that the Federal court' was under a duty to determine the rights of the. present parties upon its own independent judgment, giving to the decision in the state court only such weight as should be accorded to it according to the Sstablished principles in the law of contracts and of sound reasoning; also, that the Federal court was not bound by a decision of the state court in an action of trespass on the case for a tort not involving the title to land.
Such being the- issue,' the Circuit Court of Appeals, proceeding under the Judiciary Act of March 3d, 1891, c. 517, have sent up the following question to be answered:
“Is this court bound by the decision of the Supreme Court in the case of Griffin v. Fairmont Coal Company, that being an action by the plaintiff against thé defendant for damages for a tort, and this being an action for damages for a tort based on facts and circumstances almost identical, the language of the deeds with reference to the granting clause being [356]*356in fact identical, that case having been decided after the contract upon which defendant relies was executed, after the injury complained of was sustained, and after this action was instituted?”
There is no room for doubt as to the scope of the decision in the Griffin case. The syllabus — (p. 480) which in West Virginia is the law of- the, case, whatever may' be the reasoning employed in the opinion- of the court — is as follows: “1. Deeds conveying coal with rights of removal should be construed in the same way as. other written instruments, and the intention of the parties as manifest by the language used in the deed itself should govern. 2. The vendor of land may sell and convey his coal and grant to-the vendee the right to enter upon and under said land and to mine, excavate and remove all of the coal purchased and paid for by him, and if the removal of the coal necessarily causes the surface to subside or break, -the grantor cannot be heard to complain thereof. .3. Where a deed conveys the coal under a tract of land, together with the right to enter upon and under said land, and to mine, excavate and remove all of it, there is no implied reservation in such an instrument that the grantee must leave enough coal to support the surface in its original position. 4. It is the duty of the court to construe contracts as they are made by the parties thereto, and to give full force and effect to the language used, when it is clear, plain, simple and unambiguous. 5. It is only where the language of a contract is ambiguous and uncertain and susceptible of more than one construction that a court may, under the well-established rules of construction, interfere to reach a proper construction and make certain that which in itself is uncertain.”
Nor can it be doubted that the point decided in the Griffin case had not been previously adjudged by the Supreme Court of that State. Counsel for the Coal Company expressly state that the question here involved was never before the legislature or courts of West Virginia until the. deed involved in the [357]*357Griffin case came before the Supreme Court of that State for construction; that “until then-there was no law and no local custom upon the subject in force in West Virginia;” and that “only after the holding of the state court in the Griffin case could it be said that the narrow question therein decided had become’ a rule of property in. that State.” .
In this view of the case was not the Federal court bound to determine the dispute between the parties according to its own .independent judgment, as to what rights were acquired by them under the contract relating to the coal? If the Federal. court was of opinion that the Coal Company was under a legal obligation while taking out the coal in question to use such precautions and to proceed in such way as not to destroy or materially injure the surface land, was it bound to adjudge the contrary simply because, in a single case, to which Kuhn was not a party and which was determined after the right of the present parties had accrued and become fixed under their contract, and after the injury complained of had occurred, the state .court took a different view of the law? If, when the jurisdiction of the Federal court was invoked, .Kuhn, the citizen of Ohio had, in its judgment a valid cause of action against thé Coal Company for the injury of which he complained, was that court obliged to subordinate its view of the law to that expressed by the state court?
In cases too numerous to be here cited the general subject suggested by these questions has been considered by this Court. It will be. both unnecessary and impracticable to enter upon an extended review of those cases. They are familiar to the profession. But in.the course of this opinion we will refer to a few of them.
The question as to the binding force of state decisions received very • full consideration- in' Burgess v. Seligman, 107 U. S. 20, 33. After judgment in that case by .the United States Circuit-Court, the Supreme Court of the State rendered two judgments, each of which was adverse to the grounds upon which the Circuit Court had proceeded, and' the con[358]*358tention was that this court should follow those decisions of the state court and reverse the judgment of the Circuit Court. The opinion in that case states that in order to avoid misapprehension the court had given the subject special consideration, and the extended note, at the close of that opinion shows that the prior cases were all closely scrutinized by the eminent Justice who wrote the opinion. A conclusion was reached that received the approval of all the members of the court. We place in the margin 1an extract from; the opinion [359]*359of Mr. Justice Bradley. In Bucher v. Cheshire Railroad Co., 125 U. S. 555, 584, Mr. Justice Miller, speaking for the court, observed (p. 584): “It may be said generally that wherever the decisions of the state courts relate to some law of a local character, which may have become established by those courts, or has always been a part of the law of the State, that . the decisions upon the subject are usually conclusive, and always entitled to the highest respect of the Federal courts. The whole of this subject has recently been very ably reviewed in the case of Burgess v. Seligman, 107 U. S. 20. Where such local law or custom has been established by repeated decisions of the highest courts of a State it becomes also the law governing the courts of the United States sitting in that State.” See also Jackson v. Chew, 12 Wheat. 153.
Up to the present time these principles have not been modified or disregarded by this court. On the contrary, they have been reaffirmed without substantial qualification in many subsequent cases, some of which are here cited. East Alabama Ry. Co. v. Doe, 114 U. S. 340; Bucher v. Cheshire R. R. Co., 125 U. S. 555; Gormley v. Clark, 134 U. S. 338; B. & O. R. R. Co. v. Baugh, 149 U. S. 368; Folsom v. Ninety-six, 159 U. S. 611; Barber v. Pittsburg &c. Ry., 166 U. S. 83; Stanley County v. Coler, 190 U. S. 437; Julian v. Central Trust Co., 193 U. S. 93; Comm’rs &c. v. Bancroft, 203 U. S. 112; Presidio County v. Noel-Young Bond Co., 212 U. S. 58.
[360]*360We take it, then, that it is no longer to be questioned, that the Federal courts in determining cases before them are to be guided by. the'following rules: 1. When administering state laws and determining rights accruing under those laws the jurisdiction of the Federal court is an independent one, not subordinate to but coordinate and concurrent with the jurisdiction of the state courts. 2. Where, before the rights .of the parties accrued, certain rules.relating to real estate have been so established by state decisions as to become rules of property and action in the State,, those rules are accepted by the Federal court as authoritative declarations of the law of the State. 3. But where the law of the State has not been thus . settled, it is not only the right but the duty of the Federal court to exercise-its own judgment, as it also always does when the case before it depends upon the doctrines of commercial law and general jurisprudence.- 4. So', when contracts and transactions are entered into, and rights have accrued under a particular state of the local decisions, or when there has been no decision by the state court on the particular question involved, then the Federal courts properly claim the right to give- effect to their own judgment as to what is the law of the state applicable to the case, even where a different view has been expressed by' the state court after .the rights of parties accrued. But even in such oases,, for the sake of comity and to avoid confusion, the Federal court should always lean to an agreement with the state court if the question is balanced with doubt.
The court took care, in Burgess v. Seligman, to say that the Federal court would not only fail in its duty, but would defeat the object for which the national courts were given jurisdiction of controversies, between citizens of different States, if, while leaning to an agreement with the state court, it did not exercise an independent judgment in cases involving principles not settled by previous adjudications.
It would seem that according to those principles, now firmly established, the duty was upon the Federal court, in [361]*361the present case, to exercise its independent judgment as to what were the relative rights and obligations of the parties under their, written contract. The question before it-was as to the liability of the Coal Company for an injury arising from the failure of that corporation, while mining and taking out the coal, to furnish sufficient support to the overlying or surface land. Whether such a, case involves a rule of property in any proper sense of those terms, or only a question of general law within the province of the Federal court to determine for itself, the fact exists that there had.been no determination of the question,by the state court before the rights of the parties accrued and. became fixed under their contract,- or before the injury complained of. In either case, the Federal court was bound under established doctrines to’ exercise its own independent judgment, with a leaning, however, as just suggested, for the sake of harmony, to an agreement with the state court, if the question of law involved was. deemed to be doubtful. If, before the rights .of the parties in this case were fixed by written contract, it had become a settled, rule of law in West Virginia,.as manifested by decisions of its highest court, that the grantee or his successors in such a deed as is-here involved, was under no legal obligation to guard the surface land, of the grantor against injury resulting from the mining and removal of the coal purchased, a wholly different question would have been presented.
There are adjudged cases involving the meaning of written contracts having more or less connection with land that-were not regarded as involving a rule in the law of real estate, but as only presenting questions of general law touching which the Federal courts have always exercised their own judgment, and in respect to which they are not bound to accept the views of the state courts. Let us lopk at some of those cases. They may throw light upon the present discussion.
In Chicago City v. Robbins, 2 Black, 418, 428, which was [362]*362an action, on the case for damages, the question was as to the right of the city of Chicago — which was under a duty to see that its streets were kept in safe condition for persons and property — to hold one Robbins liable in damages for so using his lot on a public street as to cause injury to a passer-by. The city was held liable to the latter and sued Robbins on that account. The state court, in a similar case, decided for the defendant, and it was contended that the 'Federal court should accept the- views of the local court as to the legal rights of the parties. But this court, speaking by Mr. Justice Davis, said: “.Where rules of property in a State are fully settled by a series of adjudications, this court adopts the decisions of the state courts. But where private rights are to be determined by the application of common-law rules alone, this court, although entertaining for state tribunals the highest respect, does not feel bound by their decisions.”
In Lane v. Vick, 3 How. 464, 472, 476, thé nature of the controversy was such as to’ require' a construction of a will which, among other property, devised certain real estate which, at the time of suit, was within the limits of Vicksburg, Mississippi. There had been a construction of the will by the Supreme Court of the State, 1 How. (Miss.) 379, and that construction, it was insisted, was binding on the Federal court. But this court said: “Every, instrument' of writing should be so construed as to effectuate, if practicable, the intention of the- parties to it. This principle applies with peculiar force to a will. . ' . . The parties in that case were not the same as those now before this court; and that decision does not affect the interests of the complainants here. The question before the Mississippi court was, whether certain grounds, within the town plat, had been dedicated to public use. The construction of the will was incidental to the main object of the suit, and of course was not binding on any one claiming under the will. With the greatest respect, it may be proper to say, that this court - does not follow the state courts in their construction of a will or any other-ihsfru[363]*363ment, as they do in the construction of statutes. Where, as in the case of Jackson v. Chew, 12 Wheat. 167, the construction of a will had been settled by the highest courts' of the State, and had long been acquiesced in as a rule of 'property, this court would follow it, because it had become a rule of property. The construction of a statute by the Supreme Court of a State is followed, without reference to the interests it may affect, or the parties to the suit in which its construction was involved. But the mere construction of a will by a state court does not, as the construction of a statute of' the State, constitute a rule of decision for the courts of the United States. In the case of Swift v. Tyson, 16 Pet. 1, the effect of section 34 of- the Judiciary Act of 1789, and the construction of instruments by the' state courts, -are considered with greater precision th¿in is found in some of the preceding cases on the same subject.”
In Foxcroft v. Mallett, 4 How. 353, 379, the object of the action was to recover certain land in Maine. The case turned in part on the construction to be given to a mortgage of certain land to Williams. College, and to local adjudications relating to those lands, which, it was contended, were conclusive on the parties. “But,” this court said, “on examining the particulars of the cases cited to govern this (3 Fairfield, 398; 4 Shepley, 84, 88; 14 Maine R. 51), it will be seen that the construction of the mortgage to the college, in respect.to this’reservation :or condition, never appears to have been agitated. If it had been, the decision would be' .entitled to high respect, though it should not be regarded as¡ conclusive on the mere construction of a deed as to matters and language belonging to the common law, and not to any local statute. 3 Sumner, 136, 277.”
In Russell v. Southard, 12 How. 139, 147, the controlling quéstion was whéther in any case it was admissible to show by extraneous evidence that a deed on its face of certain real estate in Kentucky was really intended by the parties as a security for a loan and as a mortgage. The court, speaking [364]*364by Mr. Justice Curtis, after citing adjudged cases sustaining the proposition that evidence of that kind ,was admissible in certain States, said: “It is suggested that a different rule is held by the highest court of equity in Kentucky; If it were, with great respect for that learned court, this court would not feel bound thereby. This being a suit in • equity, and oral evidence being admitted, or rejected, not by the mere force of any state statute, but upon the principles of 'general equity jurisprudence, this court must be governed by its own views of those principles” — citing Robinson v. Campbell, 3 Wheat. 212; United States v. Howland, 4 Wheat. 108; Boyle v. Zacharie 6 Pet. 635, 658; Swift v. Tyson, 16 Pet. 1; Foxcroft v. Mallett, 4 How. 353, 379.
In Yates v. Milwaukee, 10 Wall. 497, 506, the question was as to the nature and extent of the right of an owner of land in Wisconsin, bordering on a public navigable water, to make a landing, wharf or pier for his own use or for the use of the public. There was a question in the case of dedication to public use, and the city of Milwaukee sought to change or remove the wharf erected by the riparian owner in front of his lot. This court, speaking by Mr! Justice Miller, said: “This question of dedication, on which the whole of that case turned, was one of fact, to be determined by ascertaining the intention of those who laid out the lots, from what they did, and from the application of general common law principles to their.acts. This does not depend upon state statute or local-state law. The law which governs the case is the common law, ,on which this court has never acknowledged the right of the state courts to control our decisions, except, perhaps, in a cláss of cases where the state courts have established, by repeated decisions, a rule of property in regard to land titles peculiar to the State.”
In Louisville Trust Co. v. City of Cincinnati, 76 Fed. Rep. 296, 300, 304, which was a suit by a Kentucky corporation, it became necessary to- determine the force and. effect of a mortgage originating in a state statute of Ohio and certain [365]*365municipal ordinances covering street easements in Cincinnati. The state court, in a suit to which the. trustee in the mortgage was not a party, passed a decree declaring the scope, effect and duration of contracts or ordinances under which the mortgage, easements and franchises originated. It was insisted that the Federal court was bound to accept the views of the state court. But the Circuit Court' of Appeals, held by Judges Taft, Lurton, and Hammond, ruled otherwise. Judge Lurton, speaking for all the members of that court, made ah extended review of the authorities, and observed that if the state decision was regarded as conclusive upon the parties, “the constitutional right of the complainant, as a citizen of a State other than Ohio, to have its rights as a mortgagee' defined and adjudged by a court of the United States is of no real value. If this court, cannot for itself examine these street contracts' and determine their validity, effect, and duration, and must follow the interpretation and. construction placed on them by another court in a suit begun after its rights as mortgagee had accrued, and to which it ioas not d party, then the right of such a mortgagee to have a hearing before .judgment and a trial before execution is a matter of form without substance.' The better forum for a suitor so situated would be a court of the State. . . . The validity, effect, and duration of the street easements granted or claimed under these laws and ordinances is a question which this complainant is entitled to have decided by the courts of the United States, and the opinion of the Supreme Court of Ohio, while entitled to the highest respect as a tribunal of exalted ability, can be given no greater weight or respect than its reasoning shall demand, where the contract rights of a citizen of another State are involved, who was' neither a party nor privy to the suit in which that opinion was delivered. The special fact, therefore, which justifies us in determining for ourselves the true meaning and validity of the Ohio statutes and city ordinances, out of which the rights of this complainant spring, is the fact that it' is a citizen of [366]*366another State, and that the contract under which it has ac-' qyired an interest originated prior, to the judicial opinion rebed upon as foreclosing our judgment.”
Úpon the general question as to the duty of the Federal court to exercise its independent judgment where there- had not been a decision of the state court, on the question involved, before the rights of the parties accrued, Carroll County v. Smith, 111 U. S. 556, and Great Southern Hotel Co. v. Jones, 193 U. S. 532, 548, áre pertinent. In the first-named case the court was confronted with a question as to the validity under the state constitution of a certain statute of the State. Mr. Justice Matthews, delivering the unanimous judgment of the court, said (p. 563).:. “ It was not a rule previously established, so as to -haye become recognized as settled law, and which, of course,-all parties to transactions afterwards entered into would be-presumed to know and to conform, to. When, .therefore, it is-presented for application by the courts of the United States, in a litigation growing out of the same facts, of which they have jurisdiction by reason of the citizenship of the parties, the plaintiff has a right, under' the Constitution of the United. States, to the independent judginent of those courts, to determine for themselves what is the law of the State, by which his rights are fixed and governed.. It was to that very end'that the.Con- . stitution granted to citizens of one State, suing in another, the choice of resorting to a Federal' tribunal. Burgess v. Seligman, 107 U. S. 20, 33.” The other case — Great Southern Hotel Co. v. Jones — presented a controversy hétween citizens of different States. It was sought by the plaintiffs, citizens of Pennsylvania, to enforce a mechanics’ lien upon certain real property in Ohio. The main question' was. as to the validity of a statute- of Ohio under which the alleged lien arose. ‘It was contended, that a- particular decision of the state court holding the statute td be a violation of the state constitution was conclusive upon the Federal court. But this court, following the .rules announced in Burgess v. Seligman, rejected [367]*367that view by a unanimous vote. It said (p. 548): “If, prior to the making of the contracts between the plaintiffs and McClain, the state court had adjudged that the statute in question was in violation of the state constitution, it would have been the duty of the Circuit Court, and equally the duty of this court, whatever the opinion of either court as to the proper construction of that instrument, to accept such prior decision as determining the rights of the parties accruing thereafter.'' But the decision of the state court, as to the constitutionality of the statute in question, having been rendered after the rights of parties to this suit had been fixed by their contracts, the Circuit Court would have been derelict in duty if it had not exercised its independent judgment touching the validity of the ‘statute here in question. In making this declaration we. must not be understood as at all qualifying-, the principle that, in all cases, it is the dirty of the Federal court to lean to an agreement with the state court, where the issue relates to matters depending upon the construction of the constitution or laws of the' State.”
It has. been suggested — and the suggestion cannot be passed without notice — that the views we have expressed herein are not in-harmony with'some recent utterances of this court,- and we are referred to East Cent. E. M. Co. v. Central Eureka Co., 204 U. S. 266, 272. That case involved, among other-questions, the meaning of a deed for mining property.' This' court in its opinion referrál to a decision of the state court as to the real object of the deed, and expressed its concurrence with the views of that court. That was quite sufficient to dispose of the case. But in the opinion it was further said-(p. 272): “The construction and effect of a, conveyance between private parties is a' matter as to which we follow the court of’the State” — citing Brine v. Insurance Company, 96 U. S. 627, 636; DeVaughn v. Hutchinson, 165 U. S. 566. Even if the broad language just quoted seems to- give some support to the contention of the defendant, it is to be observed that no reference is made in the opinion to the nu[368]*368•merous cases, some of which are above cited, holding that the. Federal court is not bound, in cases between citizens of different States, to follow the state decision, if it was rendered after the date of thé transaction out of which the rights of the parties arose, Certainly there was no purpose, on the part of the court, to overrule or to modify the doctrines of those cases; and the broad language quoted from East Cent. &c. v. Central Eureka Co. must therefore be interpreted in the light of the particular cases cited to support the view which that language .imports. What were those cases and what did they decide?
Brine v. Insurance Company, one of the cases cited, was a suit, in the Federal Circuit Court to foreclose a mortgage on real estate. A foreclosure and sale were had, and the decree, following the established rules of the Federal court, allowed the defendant to pay the mortgage debt in one hundred days; and. if the debt was not paid within that time, then the master was ordered to sell the land for cash in accordance with ' the course and practice of the Federal court. When the mortgage was made there was in force in Illinois and had been for many years, a statute which, if controlling, allowed the defendant, in a foreclosure suit, twelve months after sale to redeem the land sold: Thus, there was a conflict between the local statute and the rules and practice obtaining in the Federal court, and the question was whether the state statute or those rules governed the rights of the parties as to the time of redemption. This court held that the statute of the State, being in force when the mortgage in question was executed, entered into the contract between the parties and must control the determination 6'1 their rights. Speaking by Mr. Justice Miller, it said (p. 636): “The legislature of Illinois has prescribed, as an essential element of the transfer by the courts in foreclosure suits, that there shall remain to the mortgagor the right of redemption for twelve months, and to judgment creditors a similar, right for fifteen months, after the sale, before, the right of the'purchaser to the title becomes vested.' This [369]*369right, as a condition on which the title passes, is as' obligatory on the Federal courts as on the state courts, because in both cases it is made a rule of property by the legislature, which had the power to prescribe such a rule. ... At all events, the decisions of this court are numerous that the laws which prescribe the mode of enforcing a contract, which are in existence when it is made, are so far a part of the contract that no change in these laws which seriously interfere with that enforcement are valid, because they impair its obligation within the meaning of the Constitution of the United States. Edwards v. Kearzey, 96 U. S. 595. That this very right of redemption, after a sale under a decree of foreclosure, is a part of the contract of mortgage, where the law giving the right exists when the contract is made, is very clearly stated by Mr. Chief Justice'Taney, in the case of Bronson v. Kinzie, 1 How. 311.” DeVaughn v. Hutchinson, 165 U. S. 566, the other case cited, involved the construction of a will made in 1867 devising real estate in the District of Columbia, and the decision was based upon the law of Maryland as it had been often declared by the courts of Maryland to-be while this District was part of that State — indeed, as it was from the time Maryland became-aii independent State.
It thus appears that in the Brine case the rights of the parties were determined in conformity with a valid local statute in force when those rights accrued; while in the DeVaughn case, the decision was based upon the law of Maryland, while the District was a part of that State, evidenced by a series of decisions made by the highest court of Maryland, before the rights of parties accrued. Nothing in this opinion is opposed to anything said or decided in either of those cases. The question here involved as to the' scope and effect of the writing given by Kuhn to Camden does not depend upon any statute of West Virginia, nor upon any rule established by a course of decisions made before the rights of parties accrued. So that the words above quoted from East Central &c. v. Central Eureka Co. must "not be intérpreted-as applicable-to [370]*370a. case like the one before us, nor as denying the authority and duty of the Federal court, when determining the effect of conveyances or written instruments between private parties, citizens of different States, to exercise its own independent judgment where no authoritative state decision had been rendered by the state court béfore the rights of the parties accrued and became fixed.
Without expressing any opinion as to the rights of the parties under their contract, we need only say that, for the-reasons stated, the question .sent to this court by the Circuit Court of Appeals is answered in the negative. It- will be so certified.