The trial court properly sustained objection to parol evidence offered to show what the grantors of the easement intended to convey. The language of this instrument is clear and unambiguous. It clearly and definitely defines the rights of the water company in its use of the premises, and so must it be bound unless, subsequent to the execution thereof, additional rights have been acquired or plaintiff has become estopped from asserting his rights. The determination of the extent and nature of an easement by deed depends upon proper construction of the language of the instrument, without consideration of extraneous circumstances, where the language is unambiguous: Ruhnke v. Aubert, 53 Or. 6 (113 Pac. 38); 19 C. J. 908, and numerous cases therein cited. As stated in 22 C. J. 1177:
“Where the language used is clear and unambiguous, extrinsic evidence is not admissible on the ground of aiding the construction, for in such' case the only thing which could be accomplished would be to show the meaning of the writing to be other than what its terms express, * * .”
It is the duty of the court to declare the meaning of what is written in the instrument, not of what was intended to be written. Defendant is not seeking a *211reformation of the conveyance on the ground of mutual mistake. Eules of construction are not to be invoked to contradict the plain meaning and purport of the language used.
It is urged that the primary object of the grantor was to enable the Salem Water Company to procure pure and wholesome water and there is an implied covenant that it or its successor in interest has the right to do those things reasonably necessary to accomplish such object. We do not think that Minto, either expressly or impliedly, so contracted. For the' nominal consideration of supplying water to his residence, he conveyed a right of way or easement appurtenant to his land for the purpose of enabling the grantee, .as a public utility corporation, to procure water for human consumption, but specifically restricted the exercise of such right by requiring that all pipes, cisterns, cribs and other structures be constructed below the surface of the ground, so as not to interfere with his use of the land. If defendant’s construction of this contract' is correct, it might, if necessary in order to furnish pure and ample water to the inhabitants of Salem, erect a large filtration plank or some other large structure upon the land, and thereby substantially deprive plaintiff of all use of his property. Plaintiff’s use of the land is controlled largely by the determination of whether the water company has a right to continue surface filtration. If the company has the right so to maintain a pond or filtering bed, it follows that plaintiff must adapt his use of the land as not to interfere with such right. Plaintiff would not, if defendant’s construction of the easement be correct, be permitted to remove gravel so as to interfere with the impounding of water in the filtering bed, nor would it be *212consistent with the grant to allow stock to rnn at large and thereby contaminate the water. If, however, the defendant has only the right of subsurface filtration and is obliged, under its grant, to place “all pipes, wells, cisterns and filtering cribs * * far enough below the surface so that they will not interfere with cultivation of the soil or with transportation over said land,” then plaintiff’s use of the land would be far less restrictive. The relative rights and obligations of persons having easements to land and those who are owners of the servient estate are well considered in Kesterson v. California-Oregon Power Co., 114 Or. 22 (221 Pac. 826, 228 Pac. 1092), and Hotchkiss v. Young, 42 Or. 446 (71 Pac. 324). As stated in 9 R. C. L. 784:
'“The right of the easement owner, and the right of the land owner, are not absolute, irrelative, and uncontrolled, hut are so limited, each by the other, that there may be a due and reasonable enjoyment of both.”
While it is an established principle that an easement created by express grant gives to the grantee all rights which are incident or necessary to its full enjoyment, yet, under this rule, such only pass as are incident to the easement itself. It cannot operate to create a separate easement: 9 E. O. L. 785; 19 O. J. 968. Eights claimed under an implied covenant must not conflict with the express terms of the grant. Where the language of the deed is clear and unambiguous, as in the instant case, such is decisive of the limits of the easement: Fendall v. Miller, 99 Or. 610 (196 Pac. 381). In the light of the specific restrictions that defendant’s operations be below the surface of the ground, we cannot, under the guise of construing the instrument, change the plain import *213of its language so as to create tlie right to carry on operations above the surface of the ground. Nor do we think that the restrictions in the easement pertain only to the 50-acre tract. The deed does not so read. It is to be observed that the smaller tract was specifically described therein and the larger only by general reference, thus indicating that the grantor had the “gravel bar” or island particularly in mind concerning the matter of restrictions. The defendant’s predecessor in interest, the Salem Water Company, recognized that the restriction applied to the island, as evidenced by a conveyance whereby its rights in the “Minto Gravel Bar” were transferred to the defendant in 1911; “subject, however, to all the requirements, restrictions and conditions set forth in said instrument.” It is to be remembered that the plat attached to the deed of conveyance in 1897 designated the island as “Gravel Bar 12.67 acres.” We think the intention relative to restrictions is clearly established, not only from the language of the instrument, but from the construction given to the instrument by the parties themselves.
Patterson v. Chambers Power Co., 81 Or. 328 (159 Pac. 568), is typical of the cases relied upon by defendant as contrary to our conclusions relative to the rights of the parties under this easement. In the case mentioned, suit was instituted by certain property owners to enjoin the defendant company from widening a mill-race which flowed through attractive residential property in the City of Eugene. The power company asserted the right to widen the millrace in order to conduct a sufficient amount of water from the Willamette Biver for the operation of certain industrial plants, and maintained the right so to widen the race in the future as its needs required. *214The decision of that case, like many others cited, hinged upon the particular terms of the express grant. The defendant company was there given the right by deed “to bring all the water that may be required to run the mills—and all other mills or machinery that may at any time or times be placed upon the above-described premises of whatever kind or nature; also the right to dig the present raceway as wide and deep as may be necessary, * # .” In the Patterson case it is to be observed that the deed expressly granted the right which the defendant company there claimed, whereas the easement involved in this proceeding expressly prohibits the exercise of the rights which the water company here asserts. Distinction between that case and the one at bar is very apparent in view of the difference .between the terms of the respective grants. There, the easement was, indeed, general in its terms, but here it specifically limits and defines the rights which may be exercised. Each case must be considered in the light of the particular terms of the easement granted, and when so viewed, in our opinion, none cited or which we have been able to find controls the decision in this case.
Having reached the conclusion that defendant’s use of the land is not warranted under the express or implied terms of its grant, we proceed to the inquiry: Has defendant acquired an additional easement by prescription or adverse possession which would give it the right so to operate? To create an easement by prescription it is essential that the use must have been open, continuous, exclusive, and under claim of right for statutory period. Substantially the same elements must exist as where title to real property is acquired by adverse possession: City *215 of Clatskanie v. McDonald, 85 Or. 670 (167 Pac. 560); Peters v. Robertson, 73 Or. 263 (144 Pac. 568); Parrott v. Stewart, 65 Or. 254 (132 Pac. 523); Hume v. Rogue River Packing Co., 51 Or. 237 (83 Pac. 391, 92 Pac. 1065, 96 Pac. 865, 131 Am. St. Rep. 732, 31 L. R. A. (N. S.) 396). A prescriptive easement can never ripen ont of mere permissive nse no matter how long exercised: 19 C. J. 897. Defendant’s prescriptive rights, if any exist, must he based upon the use of the property in excess of that authorized by deed, under claim of right, and adverse to the owner of the servient estate. Did defendant or its predecessors in interest, regardless of the express terms of the grant, so maintain and claim the right, as against the world, to erect structures, lay pipes, and otherwise use the surface of the land in question? Or was it used with the acquiescence and permission of plaintiff or his predecessors in interest without the assertion of any claim of right on the part of the water company so to do?
Plaintiff, having established an excessive and unwarranted use, as measured by the deed of easement granted, it becomes incumbent on defendant, in order to justify its acts, to establish by a preponderance of the evidence, its alleged prescriptive rights (9 E. O. L. 781) or that plaintiff is estopped from asserting its present use is wrongful.
It is the contention of defendant that no objections whatever were made to the exercise of the rights now asserted and enjoyed on the island, until 1915, when plaintiff and his brother, Harry P. Minto, began making complaint. We are not so much concerned about the mere silence or acquiescence of the plaintiff and those from whom he acquired interest, as we are with the questions: Did defendant and its predecessor in interest continually keep the “flag *216of conquest unfurled and flying” for the prescriptive period of time? Was the use made of the land under claim of right? Was it adverse in character? It will not do to lull the owner of the land into a false sense of security by long continued negotiations or by offers to purchase additional rights. The use must be hostile and under a bona fide claim of right. An offer to purchase negatives the idea of adverse possession (9 R. C. L. 782), and, even when made after prescriptive period, it tends to show that the enjoyment was not adverse: Crosier v. Brown, 66 W. Va. 273 (66 S. E. 326, 25 L. R. A. (N. S.) 174). It is true if an easement by prescription had been acquired the mere fact that, subsequent to the prescriptive period, an offer to purchase had been made, such would not, of itself, divest defendant of title or amount to an abandonment of easement, but, nevertheless, would be strong evidence that no prescriptive rights were actually acquired. The fact that defendant in 1920 instituted condemnation proceedings to appropriate the land in question strongly refutes the claim that it had then acquired title by prescription. If defendant, in truth, had acquired the prescriptive rights claimed by it, it was a vain and idle thing to have instituted condemnation proceedings. By so doing it recognized plaintiff’s superior title. In American Bank Note Co. v. New York El. R. R. Co. et al., 129 N. Y. 252 (29 N. E. 302), the defendant company claimed title by adverse possession, but after the expiration of the statutory period, instituted an action to condemn certain rights which plaintiff had in a street. ' The court, in commenting about the admissibility of the record of such proceedings, said:
“This proceeding was necessarily a solemn and formal admission of record of title in plaintiff to the *217incorporeal rights in question. It is to he granted that such an admission made after the prescriptive right had been acquired, would not serve to destroy it. But the admission is evidence, reflecting back on what has occurred and tending to show what the real character of the possession claimed to be adverse in truth was. (Perrin v. Garfield, 37 Vt. 304). The company knew what its own possession and that of its predecessor had actually been, and it is hardly conceivable that, if such possession had been adverse either in fact or in intention, an admission would be formally made of ownership in the easements outstanding in the abutter.”
As stated in 2 C. J. 102:
“A recognition of the title of the true owner after the bar of the statute has run, so as to complete the title of the adverse claimant, will not alone defeat the title so acquired, but such recognition is evidence to be considered in determining whether in fact the prior possession of the adverse claimant was in fact adverse or a possession in subordination to the title of the true owner.”
The restrictions in the deed of the Salem Water Company to defendant are also worthy of consideration relative to this phase of the case. Was this not a recognition of the limitations of its easement?
Defendant invokes the doctrine of estoppel. It says that plaintiff and his predecessors, for many years without objection, have allowed extensive and valuable improvements to be made on the island, and ought not now be heard to complain. There is no evidence that the plaintiff or his predecessors ever encouraged the water company to do what it has done. Protests and objections have been silenced with the promise to purchase or condemn the property. Mere silence or passive acquiescence will not, of itself, constitute estoppel. Fraser v. Portland, 81 Or. 92 (158 *218Pac. 514, 9 A. L. R. 614); Stephens v. City of Eugene, 90 Or. 167 (175 Pac. 855). The following letter, written by the vice-president of defendant company, does much to refute this contention:
“May 27, 1916.
“Mr. D. 0. Minto,
“Salem, Oregon.
“Dear Sir:
“Eelative to your claim that the Salem Water, Light & Power Company has exceeded its right by the present development work done on Minto’s Gravel Bar near the City of Salem, will say it was my understanding in our recent conversation that the matter of determining whether we were exceeding our rights in said matter was to be deferred until the return of Mr. Park, and it was not my understanding that we were to cease work in the meantime.
“As soon as Mr. Park returns we will take the matter up with you and try to come to some satisfactory understanding’ about it and no advantage will be taken of the fact that we did work on the Gravel Bar after my talk with you.
“Nothing in our conversation in our office, or over the phone or in this letter is to be construed as prejudicial to the interests of any of the parties.
“Hoping that all misunderstandings may be satisfactorily adjusted, I remain,
“Very truly yours,
“Paul B. Wallace.’’
We concur with the learned trial judge that defendant has exceeded its rights under the easement granted and that no prescriptive rights have been acquired. Defendant was not misled. Estoppel is not involved.
We turn then to the question: To what equitable relief, if any, is plaintiff entitled? As a matter of simple justice, so far as the water company is concerned, it ought to do one of three things: *219(1) Abide by its contract; (2) Compensate plaintiff for rights taken in excess of those granted, or (3) Abandon the easement and vacate the premises. It does not follow, however, as a matter of right, because there has been a breach of plaintiff’s legal rights, that he is entitled to the extraordinary remedy of injunction. Even though there has been a continuing trespass and a multiplicity of actions would result if the plaintiff were obliged to seek redress at law, equity will not raise its restraining arm if, by so doing, great and irreparable injury might result to the public: Booth-Kelly Lumber Co. v. Eugene, 67 Or. 381 (136 Pac. 29); Cubbins v. Mississippi River Com., 204 Fed. 299; York Haven Water & Power Co. v. York Haven Paper Co., 201 Fed. 270; 32 C. J. 81, and cases in note, 14 Am. & Eng. Ann. Cas. 20. The defendant company is under contractual obligations to supply the inhabitants of the City of Salem with water. Having in mind the consequences that would result by summarily cutting off the water supply of a city, we proceed with caution that there be no unreasonable interference with such public service. Plaintiff does not seek to enjoin defendant from supplying good and wholesome water as in Frost v. City of Los Angeles, 181 Cal. 22 (183 Pac. 342, 6 A. L. R. 468), but only insists that the company be compelled, in rendering its service, to abide by the terms of its easement. "We are not convinced that the present filtration system used by the defendant is the only way in which an adequate amount of pure water can be supplied. As a matter of economy and convenience it may excel any other plan, but such reasons do not warrant the taking of private property without compensation nor should they cause a court of equity to refuse the equitable relief sought. Plain*220tiff’s property rights are sacred. The constitutional guarantee that “Private property shall not be taken for public use * * without just compensation first assessed and tendered” (Art. I, § 18, Constitution of Oregon) ought to mean something. Plaintiff has no adequate remedy at law to obtain redress for a continuing wrong—especially where the damages sustained are uncertain and difficult of proof. Equity, with its broad and flexible rules, ought to grant relief if no serious inconvenience and damage to the public would thereby result. In 32 C. J. 82, it is stated:
“If * * the alleged necessity for protecting the public interest and convenience is nothing more than a pretense and a cloak for the unlawful appropriation of private property to suit defendant’s convenience, no reason exists why an injunction should not be granted, to restrain such unlawful acts.”
In cases involving public convenience there is no hard and fixed rule for determining whether an injunction should be granted or refused. Each case necessarily depends upon its own particular facts and circumstances. The question of public interests as a determining factor in proceedings of this character is well considered in Mobile O. R. Co. v. Zimmern, 206 Ala. 37 (89 South. 475, 16 A. L. R. 1352), citing Pomeroy Eq. Jur. (4 ed.), § 1922. In Booth-Kelly Limber Co. v. Eugene, supra, no direct trespass on property was involved, and this court, in view of all the facts and circumstances, refused to issue an injunction. However, in Fraser v. Portland, supra, and in Stephens v. Eugene, supra, injunction was granted notwithstanding the convenience of the public was directly involved. In Schwarzenbach v. Oneonta Light & Power Co., 144 App. Div. 884 (129 N. Y. Supp. 384), the defendant was engaged in supplying *221electricity to the inhabitants of a certain municipality and injunction was suspended as long as the company was thus engaged, but on appeal, 207 N. Y. 671 (100 N. E. 1134) the decree was modified to suspend the operation of the injunction until a date certain, thereby giving the defendant a reasonable time in which so to change its operations as not to trespass on the rights of the plaintiff. Also, see Sammons v. City of Gloversville, 175 N. Y. 346 (67 N. E. 622), wherein the city was restrained from committing a continual trespass by polluting a stream, but operation of.decree was suspended until necessary rights could be acquired by purchase or condemnation. In Grey v. Paterson, 60 N. J. Eq. 385 (45 Atl. 995, 83 Am. St. Rep. 642, 48 L. R. A. 717), certain riparian owners were denied the right to enjoin a city from emptying sewage into a stream which flowed by their property, but the court, in so doing, used the following language:
“If these complainants amend their bill, or file a new bill asking- for an injunction, unless the city will consent to make such compensation for the diminution in the value of their lands as shall be ascertained to be just, such equitable relief can be given to them.”
We are unable to agree with the contention that the damages sustained by plaintiff are so trivial that equity oug-ht hot to act. It is true that the land in question at this time has no value for cultivation purposes, but the record discloses that it was leased from 1904 to 1916 and again in 1919, for its sand and gravel rights, for which rentals of $1,000 to $1,500 per annum were paid. Plaintiff testified that, since 1919, he has been unable to lease the island for the purposes above stated, on account of the interference of the defendant company in carrying- on its present *222operations and because of the uncertainty of his title in view of the rights asserted by the water company. The contention of the plaintiff in this respect is, to some extent, substantiated by a letter written by the president of the defendant company in January, 1920, to the Salem Sand & Grravel Company—which had acquired certain sand and gravel rights on the island —admonishing it not to dig sand and gravel near filtering cribs or to “disturb or in any way endanger what work we have already constructed there, * * .”
After careful consideration, we are of the opinion that plaintiff is entitled to a decree enjoining the defendant company as prayed for in the complaint herein, unless within a reasonable length of time it acquires by purchase or condemnation the property rights exercised in excess of those granted by the easement; provided further that, if defendant does not so elect to acquire the rights above mentioned and desires to change its manner of operation so as to conform, in the light of this opinion, to its deed of easement, then the injunction order will be suspended until the defendant has had a reasonable time, after the water covering the island has receded, in which to accomplish such purpose. In the event that defendant elects to institute condemnation proceedings it must be done within sixty days from date of mandate of this court. As to what constitutes reasonable time as specified herein is a matter for the determination of the trial court.
The decree dismissing this suit is reversed and the cause remanded, with directions to proceed not inconsistent with this opinion. Plaintiff is awarded costs and disbursements in this and in the lower court.
Beversed and Bemanded.
McBride, C. J., and Band and Coshow, JJ., concur.