DIES, Chief Justice.
Plaintiffs below are successors in title to W. N. Foster and Keystone Mills Company, who as lessors entered into an oil, gas, and mineral lease and operating agreement with Sun Oil Company, as lessee, and defendant below, covering 640 acres of land in the Bricker Survey of Montgomery County, Texas. Plaintiffs brought suit for a declaratory judgment praying that such agreement required defendant to account to plaintiffs (as derivative lessors) for the royalties therein provided, and also for one-half of the seven-eighths working interest in oil, condensate, and gas (including cas-inghead gas).
Both sides filed motions for summary judgment; the trial court granted plaintiffs a partial summary judgment, from which order defendant perfects this appeal. In this opinion, the parties will be referred to as appellant and appellees.
At issue is the interpretation of Paragraph Y of the 1932 lease which reads as follows:
“In addition to the royalty provided for in the preceding paragraph, Lessee shall deliver to Lessors in the proportions set out above, one-half of the oil accruing to the seven-eights working interests from that produced and saved from said land.... ”
From the date of the lease until August 1977, appellant paid to appellees not only one-half royalty of the working interest in oil (after deducting certain costs) but also one-half of the working interests on gas, casinghead gas, and condensate.
In 1977 appellant drilled deeper to new “horizons” on the leased land, discovered additional gas, and then sent the following letter (dated August 31, 1977) to appellees:
“Reference is made to the subject Division Orders and to the fact that you were credited with a working interest in the gas, including casinghead gas, in such Division Order. This is to advise you that you were incorrectly credited with such working interest, and that the interest credited to you thereon should have been credited to Sun Oil Company (Delaware).
“This letter will constitute our notice to you of the revocation of such Division Orders to the extent that you are credited with a working interest in gas, including [800]*800casinghead gas thereon. The entire .875000 working interest in gas, including casinghead gas, hereafter will be credited to Sun Oil Company. Appropriate adjustment for past overpayments is under the question of review by Sun at this time.”
Both sides agree that there are no genuine issues of fact and that the agreement is unambiguous. All of appellant’s points contest the court’s construction of the agreement to include gas.
Appellant contends the agreement clearly limits appellees’ working interest to “oil”; appellees say when you consider the entire instrument, how the parties themselves interpreted it, and the amendments thereto, the court’s interpretation was correct. Appellant said in the trial court that its prior (over forty years) payments were a “gratuity,” or “mistake.”
Recently our Supreme Court said in Harris v. Rowe, 593 S.W.2d 303, 306 (Tex.1979):
“Where a question relating to the construction of a contract is presented to this Court, we will consider the wording of the instrument, in the light of surrounding circumstances, apply the appropriate rules of construction and settle the meaning of the contract.... The primary object of courts in construing written contracts is to arrive at the intention of its parties. Skelly Oil Co. v. Archer, 163 Tex. 336, 356 S.W.2d 774 (1962).”
The same decision, Harris v. Rowe, supra at 306, wrote:
“No principle of interpretation of contracts is more firmly established than that great, if not controlling, weight should be given by the court to the interpretation placed upon a contract of uncertain meaning by the parties themselves. Courts rightfully assume that parties to a contract are in the best position to know what was intended by the language employed. James Stewart & Co. v. Law, 149 Tex. 392, 233 S.W.2d 588 (1950). The court should adopt the construction of the instrument as placed upon it by the parties unless there is clear language in the instrument indicating an intention to the contrary. Col-Tex Refining Co. v. Coffield & Guthrie, Inc., 264 S.W.2d 462 (Tex.Civ.App.—Eastland 1954, writ ref’d).”
And in Universal C.I.T. Credit Corp. v. Daniel, 150 Tex. 513, 243 S.W.2d 154, 157 (1951), Judge Calvert in writing for the Court said:
“In the interpretation of contracts, whether they be ambiguous in the sense that that term is here defined or simply contain language of doubtful meaning, the primary concern of the courts is to ascertain and to give effect to the true intention of the parties. To achieve this object the courts will examine and consider the entire writing, seeking as best they can to harmonize and to give effect to all provisions of the contract so that none will be rendered meaningless.”
See also Woods v. Sims, 154 Tex. 59, 273 S.W.2d 617 (1954); McMahon v. Christmann, 157 Tex. 403, 303 S.W.2d 341 (1957); City of Pinehurst v. Spooner Addition Water Co., 432 S.W.2d 515 (Tex.1968); 2 C. McCormick & R. Ray, Texas Law of Evidence § 1681 (3rd ed. 1980); Zeppa v. Houston Oil Co. of Texas, 113 S.W.2d 612, 615 (Tex.Civ.App.—Texarkana 1938, writ ref’d). With these principles in focus, we shall try to construe this agreement.
Surrounding Circumstances: The land leased by appellant in this agreement was adjacent to a proven field, the Montgomery field. This somewhat unusual and generous agreement was negotiated by W. N. Foster, a Conroe attorney, with awareness of its value. At the time of the original agreement, condensate and gas (including casing-head gas) had only a fraction of modern values. See Exxon Corporation v. Jefferson Land Co., Inc., 573 S.W.2d 829 (Tex.Civ.App.— Beaumont), writ ref’d per curiam, (Tex.1980) [not yet reported except in 24 Tex.Sup.Ct.J. 41 (Oct. 22, 1980)].
Interpretation by and Conduct of the Parties: As previously stated in this opinion, from the time of execution of the original lease in 1932, until the letter of August [801]*8011977, set forth above, appellant paid appel-lees one-half (½) royalty of the seven-eighths (⅞) working interest in not only the oil produced, but also the condensate and gas, including casinghead gas.
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DIES, Chief Justice.
Plaintiffs below are successors in title to W. N. Foster and Keystone Mills Company, who as lessors entered into an oil, gas, and mineral lease and operating agreement with Sun Oil Company, as lessee, and defendant below, covering 640 acres of land in the Bricker Survey of Montgomery County, Texas. Plaintiffs brought suit for a declaratory judgment praying that such agreement required defendant to account to plaintiffs (as derivative lessors) for the royalties therein provided, and also for one-half of the seven-eighths working interest in oil, condensate, and gas (including cas-inghead gas).
Both sides filed motions for summary judgment; the trial court granted plaintiffs a partial summary judgment, from which order defendant perfects this appeal. In this opinion, the parties will be referred to as appellant and appellees.
At issue is the interpretation of Paragraph Y of the 1932 lease which reads as follows:
“In addition to the royalty provided for in the preceding paragraph, Lessee shall deliver to Lessors in the proportions set out above, one-half of the oil accruing to the seven-eights working interests from that produced and saved from said land.... ”
From the date of the lease until August 1977, appellant paid to appellees not only one-half royalty of the working interest in oil (after deducting certain costs) but also one-half of the working interests on gas, casinghead gas, and condensate.
In 1977 appellant drilled deeper to new “horizons” on the leased land, discovered additional gas, and then sent the following letter (dated August 31, 1977) to appellees:
“Reference is made to the subject Division Orders and to the fact that you were credited with a working interest in the gas, including casinghead gas, in such Division Order. This is to advise you that you were incorrectly credited with such working interest, and that the interest credited to you thereon should have been credited to Sun Oil Company (Delaware).
“This letter will constitute our notice to you of the revocation of such Division Orders to the extent that you are credited with a working interest in gas, including [800]*800casinghead gas thereon. The entire .875000 working interest in gas, including casinghead gas, hereafter will be credited to Sun Oil Company. Appropriate adjustment for past overpayments is under the question of review by Sun at this time.”
Both sides agree that there are no genuine issues of fact and that the agreement is unambiguous. All of appellant’s points contest the court’s construction of the agreement to include gas.
Appellant contends the agreement clearly limits appellees’ working interest to “oil”; appellees say when you consider the entire instrument, how the parties themselves interpreted it, and the amendments thereto, the court’s interpretation was correct. Appellant said in the trial court that its prior (over forty years) payments were a “gratuity,” or “mistake.”
Recently our Supreme Court said in Harris v. Rowe, 593 S.W.2d 303, 306 (Tex.1979):
“Where a question relating to the construction of a contract is presented to this Court, we will consider the wording of the instrument, in the light of surrounding circumstances, apply the appropriate rules of construction and settle the meaning of the contract.... The primary object of courts in construing written contracts is to arrive at the intention of its parties. Skelly Oil Co. v. Archer, 163 Tex. 336, 356 S.W.2d 774 (1962).”
The same decision, Harris v. Rowe, supra at 306, wrote:
“No principle of interpretation of contracts is more firmly established than that great, if not controlling, weight should be given by the court to the interpretation placed upon a contract of uncertain meaning by the parties themselves. Courts rightfully assume that parties to a contract are in the best position to know what was intended by the language employed. James Stewart & Co. v. Law, 149 Tex. 392, 233 S.W.2d 588 (1950). The court should adopt the construction of the instrument as placed upon it by the parties unless there is clear language in the instrument indicating an intention to the contrary. Col-Tex Refining Co. v. Coffield & Guthrie, Inc., 264 S.W.2d 462 (Tex.Civ.App.—Eastland 1954, writ ref’d).”
And in Universal C.I.T. Credit Corp. v. Daniel, 150 Tex. 513, 243 S.W.2d 154, 157 (1951), Judge Calvert in writing for the Court said:
“In the interpretation of contracts, whether they be ambiguous in the sense that that term is here defined or simply contain language of doubtful meaning, the primary concern of the courts is to ascertain and to give effect to the true intention of the parties. To achieve this object the courts will examine and consider the entire writing, seeking as best they can to harmonize and to give effect to all provisions of the contract so that none will be rendered meaningless.”
See also Woods v. Sims, 154 Tex. 59, 273 S.W.2d 617 (1954); McMahon v. Christmann, 157 Tex. 403, 303 S.W.2d 341 (1957); City of Pinehurst v. Spooner Addition Water Co., 432 S.W.2d 515 (Tex.1968); 2 C. McCormick & R. Ray, Texas Law of Evidence § 1681 (3rd ed. 1980); Zeppa v. Houston Oil Co. of Texas, 113 S.W.2d 612, 615 (Tex.Civ.App.—Texarkana 1938, writ ref’d). With these principles in focus, we shall try to construe this agreement.
Surrounding Circumstances: The land leased by appellant in this agreement was adjacent to a proven field, the Montgomery field. This somewhat unusual and generous agreement was negotiated by W. N. Foster, a Conroe attorney, with awareness of its value. At the time of the original agreement, condensate and gas (including casing-head gas) had only a fraction of modern values. See Exxon Corporation v. Jefferson Land Co., Inc., 573 S.W.2d 829 (Tex.Civ.App.— Beaumont), writ ref’d per curiam, (Tex.1980) [not yet reported except in 24 Tex.Sup.Ct.J. 41 (Oct. 22, 1980)].
Interpretation by and Conduct of the Parties: As previously stated in this opinion, from the time of execution of the original lease in 1932, until the letter of August [801]*8011977, set forth above, appellant paid appel-lees one-half (½) royalty of the seven-eighths (⅞) working interest in not only the oil produced, but also the condensate and gas, including casinghead gas.
In December 1932, a memo from its general agent to one of Sun’s lawyers was consistent with the trial court’s interpretation of the agreement, and more importantly a title opinion of another of Sun’s attorneys in its legal department, dated August 8, 1935, reflected ownership of casinghead gas as follows:
W. N. Poster, 14/48 W.I.
Keystone Mills, 7/48 W.I.
W. N. Poster, 1/12 R.I.-
Keystone Mills, 1/24 R.I.”
On December 26, 1962, another attorney in Sun’s legal department wrote an interoffice memorandum to the manager, Gulf Coast Division of Sun, as follows:
“This will confirm our discussion of our above mentioned lease, under which the lessors not only have a royalty but have a working interest under the special terms and provisions therein contained.
“We have been accounting to them for their interest in the working interest — as well as their royalty interest as to casing-head gas — and also gas-well gas and condensate as well as to oil for many years and we have concluded to continue as heretofore, based upon our consideration of the various aspects of the matter at this time. I am sending a copy of this memo to various others who have had occasion to give some consideration to this matter for their information and guidance.”
Entire writing: Paragraph VIII provides, inter alia, that the costs of drilling were to be borne solely by appellant and that the cost and expense of producing and lifting the oil, including a six percent overhead factor, was to be charged to a joint account of lessor and lessees. The following clause is present in this paragraph:
“... and said account shall also reflect all receipts and revenues for oil, gas and other minerals produced and saved hereunder.” (Emphasis supplied.)
Paragraph XVI, dealing with ad valorem taxes, provides:
“Any increase in ad valorem taxes assessed against the lands included in this lease by reason of the discovery and production of oil thereon, under this lease, shall be borne fifty-six and twenty-five hundredths (56.25) per cent by Lessors and forty-three and seventy-five [hundredths] (43.75) per cent by Lessee; provided, however, that if the royalty and working interest shall be separately assessed, then Lessors shall pay all taxes on the royalty interest in and surface of said land, and one-half of the taxes accruing against the working interest shall be chargeable to the joint account provided for in Paragraph VIII hereof. Ad valo-rem taxes on personal property and equipment on the lease shall be borne by the parties hereto in the proportion of their ownership of same as hereinabove provided.” (Emphasis supplied.)
And perhaps most important of all in construing the entire writing to find the intent of the parties, in 1935 the parties amended the agreement. Paragraph IV of the instrument was amended to read:
“Lessee shall have free use of oil, gas, coal, and water from said land, except water from lessor’s wells, for all operations, including drilling operations, hereunder and the royalty on oil, gas and coal and the deliveries to lessors of one-half (⅜) of the oil, gas and other minerals accruing to the seven-eights (Vsths) working interest, as more particularly provided hereafter, shall be computed after deducting any so used. In lieu of using the identical fuel produced from the premises, lessee may use other fuel of no greater value and charge same against the production from the premises in account ing for both the royalty and the working interest oil, gas and other minerals deliverable to lessors hereunder, and if it is more economical to use electric or other power instead of using fuel from the premises for operations, including drilling operations, lessee may use such power [802]*802and charge the cost thereof against the production from the premises.” (Empha.sis supplied.)
We believe the trial court correctly interpreted and construed the agreement in question, and, so believing, overrule all of appellant’s points of error, and affirm the trial court’s “Final Judgment” granting ap-pellees a partial summary judgment.
AFFIRMED.
ON REHEARING