Plaintiffs sued defendant on a quantum meruit for .work and labor and materials furnished in straightening and grading road-bed and removing old track and relaying the same on the line oi said Crystal railway between Crystal Station on the Iron Mountain road and Hay’s‘Landing on the Mississippi river. The balance claimed is $15,382.33. They obtained a judgment from which defendant has appealed. I de not deem it necessary to copy into this opinion the pleadings or instructions, or to detail the evidence except ■so far as may be necessary to a proper consideration oi the questions involved.
The matters in controversy are the following:
1. Plaintiffs claim for the excavation of 2,685 cubic yards of flint rock at $4.45 per cubic yard, and defendant contends that they are only entitled to ninety-five cents, the contract price for the excavation of solid rock.
2. Plaintiffs claim compensation for the excavation of rock, made in consequence of the width of the cul being in excess of that required by the contract, while ■defendant insists that this extra excavation was not required by the contract, or made at defendant’s request, but was a consequence of the negligent and unskilful manner in which plaintiffs did their work.
3. Plaintiffs claim compensation for other extra work which defendant contends was not done at its request or in consequence of any changes in its plans.
4. The defendant claims, as liquidated damages *403•fixed by tlie contract for the failure of plaintiffs to complete the work within the time agreed, twenty-five dollars per day from the day it should have been completed to the day it was finished ; while plaintiffs’ contention is that the delay was occasioned by changes in defendant’s plans, and by reason of having to excavate a stratum of flint rock much more difficult to excavate than limestone Took, the latter of which they were by defendant induced to believe was the only solid rock they would encounter. The work was done under a written contract between the parties, executed on the thirtieth day of November, 1880, by which it was stipulated that the work should be finished within one hundred working days from the fourth of December, 1880 ; and that for ■every working day, beyond one hundred, that the complete and faithful execution of the contract should be delayed, the sum of twenty-five dollars per day should be deducted as liquidated damages, etc.
It was also agreed that defendant should pay for •said work the following prices: “For earth excavation (five hundred feet average haul) twenty-two cents per cubic yard ; for loose rock (five' hundred feet average haul) twenty-two cents per cubic yard ; for solid rock (five hundred feet average haul) ninety-five cents per •cubic yard.” The court by its instructions left it to the jury to determine the meaning of the term “solid rock.” No evidence was offered by plaintiffs to show that the term “solid rock” was used in the contract in any other than its plain, ordinary and popular sense. The word “solid” is defined by Webster as follows: “Having the constituent parts so firmly adhering as to resist the impression or penetration of other bodies ; hard, firm, compact, opposed to fluid and liquid, or to plastic, like clay or to incompact, like sand.” “Custom may control and vary the meaning of words, giving •even to such words as those of number, a sense entirely •different from that which they commonly bear.” 2 Pars. *404Cont. (6 Ed.) *538; Hinton v. Locke, 5 Hill, 437; Eaton v. Smith, 20 Pick. 150.
But courts cannot adopt a construction of any legal instrument which shall do violence to the rules of language or to the rules of law. “ The construction of all written instruments belongs to the courts alone, whose duty it is to construe all such instruments as soon as the true meaning of the words in which they are couched, and the surrounding circumstances, if any, have been ascertained as facts by the jury.” Neilson v. Harford, 8 Mees. & W. 806-823. ‘ ‘ If the meaning of the instrument by itself is affected with uncertainty, the intention of the parties may be ascertained by extrinsic testimony.” 2 Pars. Cont. (6 Ed.) *564. “Where the whole matter passes in parol, all that passes may sometimes be taken together as forming part of the contract, though not always, because matter talked of at the commencement of a bargain may be excluded by the language used at its termination. But if the contract be in the end reduced to writing, nothing which is not found in the writing can be considered as part of the contract.” Abbott, C. J., in Kain v. Old, 2 Barn. & C. 634. The only testimony introduced by plaintiffs' was to the effect that it was worth four or five times more to excavate flint rock than limestone ; but their own witness testified on cross-examination that solid rock would be a compact mass of rock, as the contract says, and that if the contract did not speak of any material except solid rock and loose rock, solid'rock would mean in that contract any kind; of rock if it was solid.
The question propounded by plaintiffs to this witness, viz : “ Suppose that you were shown, at the time the bid was made, limestone rock, how would the words ‘solid rock’ be ’ construed in that case,” should have been excluded; The hypothetical fact, if conceded, would not affect the meaning of the words “ solid rock*” *405but would be admissible ou the issue of fraud or mistake. Surrounding circumstances are to be considered only when the meaning of the instrument is affected with uncertainty, Kimball v. Brawner, 47 Mo. 399. When the terms are clear and unambiguous the party can relieve himself of the liability they impose by proving fraud or mistake, or that by the custom they were used in these contracts in a sense different from their ordinary import. If the words were inserted by mistake the contract might be set aside. “For if the words employed were those intended to be used,’but their actual meaning was totally different from that which the parties supposed and intended them to bear, still this actual meaning would generally if not always be held to be their legal meaning. Upon sufficient proof that the contract did not express the meaning of the parties, it might be •set aside; but a contract which the parties intended to make but did not make cannot be set up in the place of one which they didmakebut did not intend to make.” 2. Pars. Cont. (6.Ed.) *496. It ivas the.duty of the court to ■construe the contract in this instance by its terms, there being no testimony tending to prove that the words solid rock” were used in any other than their plain -and popular sense.
• As to the second and third points, which may be •considered together: For any excavation of rock in excess of what was called for by the contract, occasioned by the unskilful or negligent manner in which plaintiffs ■did the work they had undertaken, they cannot recover. If, however, plaintiffs at defendant's request or in consequence of any change in the plans and specifications for the work did more work than was contemplated by the contract, they are, of course, entitled to recover for such additional work.
With respect to defendant’s claim for liquidated damages: After the original contract was entered into -and plaintiffs had performed a considerable portion of *406the work, and after the expiration of the one hundred days specified for the completion of the work in May or June, 1881, at the instance -of plaintiffs, a supplemental agreement was entered into by which defendant waived; any claim for damages for the delay which had then occurred and extended the time for the completion of the work to the tenth day of July, 1881, and renewed the stipulation with regard to liquidated damages for any delay in the completion of the work after the tenth of July, 1881. The work was not finished until the twenty-fourth of December, 1881. In the absence of evidence-to show that the words “solid rock” were used in a sense different from their ordinary and popular meaning, the facts that plaintiffs, in the prosecution of the work, encountered one or more strata of flint rock, affords no defence against defendant’s claim for liquidated damages unless they can show that defendant falsely and fraudulently represented to them that the rock to be excavated was limestone rock. If they were delayed in the completion of the work by having unavoidably blasted more rock than was required by the width of the-cut while performing the work in a prudent, careful and skilful manner, any delay occasioned thereby should be-allowed them in estimating defendant’s damages for the delay; so for any delay occasioned by any changes m the plan of the work, or any extra work done at defendant’ s request. An honest expression of opinion by defendant that the material to be excavated was limestone-rock, is no defence to defendant’s demand for liquidated damages, any more than it would entitle plaintiffs to recover of defendant more than the contract price for excavating the flint rock. And even if such fraudulent representations were made by defendant to induce plaintiffs to enter into the contract, yet, if plaintiffs after-wards entered into the supplemental contract with knowledge that they would encounter a stratum of flint rock in the prosecution of the work, they can neither-*407recover more than, ninety cents per cubic yard for excavating the flint rock, nor successfully defend against defendant’s claim for liquidated damages. It would be in effect a re-execution of the original contract with full-knowledge that the representations made by defendant were false.
Nor was the testimony admissible that defendant’s agent represented to another party, who contemplated making a bid on the work, that the rock to be excavated was limestone rock. That he made such a statement to another party was wholly irrelevant. If he had stated to another party that there was flint rock as well as limestone in the hill, it would, if the issue were properly framed as to fraud, be admissible to prove knowledge on the part of defendant. Parties are bound by the terms of their contract, and while it may be a hardship upon plaintiffs to be compelled not only to answer for liquidated damages for the delay in the- completion of the work, but to accept ninety cents per cubic yard for excavating flint rock, it is the contract they made, and the courts cannot make a different one for them. “ If a party, b.y his contract, charge himself with an obligation possible to be performed, he must make it good unless its performance is rendered impossible by the act of God, the law or the other party. Unforeseen difficulties, however great, will not excuse him.” Dermott v. Jones, 2 Wall. 9; Paradine v. Jayne, 2 Alleyn, 27; Beebe v. Johnson, 19 Wend. 500; School Trustees v. Bennett, 3 Dutch. 513.
This cause was tried on a different theory of the law than that herein indicated as the correct one, and as to fraud in procuring-plaintiffs to make the contract, it is not properly pleaded by the plaintiffs. There is no allegation in the petition, or in the replication, that in order • to induce plaintiffs to make the contract, defendant, knowing there was flint rock in the excavation to be *408made, falsely and fraudulently represented to plaintiffs that the solid rock to be excavated was limestone rock.
The judgment is reversed and the cause remanded.-
Norton and Sherwood, JJ., dissent.