Opinion of the court by

The defendant in error, Lena Fellner, brought an action in the district court of Noble county against the plaintiffs in error, S. E. Richardson and F. A. Richardson, to recover judgment on a mote for the sum of $500, executed by the Richardsons to Samuel Fellner, and by him assigned to Lena Fellner, as collateral- security for another debt, and to (have declared and enforced a vendor’s lien for the amount of said note against certain ical estate described in the note. S-. E. Richardson and F. A. Richardson denied1 the execution of the note under oath. After some preliminary rulings and amendments of pleadings, which are not material here, the cause went to trial to a jury upon the issues made by the allegations of the last amended petition, and the plea of non est factum.

After the plaintiff had introduced her evidence and rested, the defendants demurred to the evidence. The demurrer was overruled, and proper exception's1 saved by the defendants. After the defendants had submitted their evidence, the court took the cause- from the jury, and directed a verdict for plaintiff for the amount claimed in the petition. _ The defendants filed their motion for -a new trial, which was overruled, and proper *516 exception's saved, and they now bring the cause here by petition in error. ■

A number of errors are alleged to liave been commit Led during the trial, by the trial court.

The copy of the note attached to the petition is as follow®:

“$500.00 ■ PERRY, O. T., Dec. 8, 1894.

“One year after date we promise to pay to the order of Samuel Feline?, Five Hundred Dollars for purchase price of buildings and Lot (l).one, in Block 28, in the city of Perry, O. T., with interest from date at 8 per cent., per annum, value received.

“Due Dec. 8, 1893.

“S. E. Richardson,

“F. A. Richardson.”

It was contended by the defendants below, that the mote sued on had been altered after its delivery to the agent of the payee, by erasing the word “on” between tlhe word “buildings” and the word “lot,” and inserting In lieu thereof the word “and.” That as originally executed the note was given “for purchase price of buildings om lot 1, in block 28, in the city of Perry, O. T.,” and not “for purchase price'of buildings and lot;”’ and this issue was presented by the verified denial of the execution of the note sued on. The note was originally taken by C. A. Morris, attorney for Samuel Fell-mer, was executed at Perry, O. T., at a time when the payee was a resident of and in New York City. The Payee, Samuel Fellner, assigned ihe note to- his wife, Lena. Fellner, by a written assignment, executed by a •separate instrument, which instrument was executed in New York at a time and while the note was in the possession of Morris, at Perry.

*517 The plaintiff alleged- in her petition that the note was lost, and could not be produced on the trial of the cause-, and on the trial the court permitted the contents -of the note to- be sho-wn by -secondary evidence. This ruling of the court is assigned as error.

It is a well settled rule of the law of evidence that secondary evidence cannot be used to prove the content* of a written instrument until the loss of the original ha» been shown, or its- absence satisfactorily accounted for. In this case Morris, the attorney and agent for Samuel Fellner, the payee, -testified that he had the note in his possession for a short time after its execution, and that he then transmitted it by mail to the payee, Samuel Fellner, in New York; that he had not had it in h-i-s possession since that time, and had no information or knowledge as to where the note was at that time. The plaintiff, Lena Fellner, testified that she had never had the possession of the note, and knew nothing of its whereabouts. On this testimony, the cou t permitted a copy of the note to be introduced in evidence.

This was prejudicial error. The loss of the note had not even been prima facie shown. The note was payable to Samuel Fellner. His agent, Monis-, testified- that he transmitted the note by letter through the mails to the payee in New York. No effort was made to «how that Samuel Fellner had not received the note. .The presumption is that he did receive it, and that he still has it. He did- not testify as a witness, and it was not shown that the n-o-te was ever in the possession of any other person after Morris mailed it to him. It was-not attempted to be shown that any search had been made by Samuel Fellner to discover the note, and the loss of *518 the note is nut sufficiently ac-ounted for to entitle the plaintiff to proye its contents by secondary evidence. ■

It was a controverted question oin the trial as to whether the copy sued on was a copy of the original note, and it became highly important to have the original note produced for inspection. The .court excluded all evidence as to whether any alternation had been made in the note. The plaintiff, in (her petition' claimed1 a vendor’s lien on the real estate described in tbe instrument, and this claim was based upon the recital in the note that it was given for “Lot one.”

The learned justice who tried the case held (that the assignee of the note could not enforce the lien which the payee had for unpaid purchase money, and that when the vendor assigned the note to -the plaintiff, the lien was discharged-. Based upon this holding the trial court further held that the alleged alteration of the note sued •on was immaterial. The trial court fell into error in holding that the assignment introduced in evidence was such an assignment as discharged the vendor’s lien, and from thence tried the case upon a wrong theory, which rendered practically all the subsequent rulings erroneous.

The instrument of assignment, under which Lena Fell-ner claimed title to the note, recited that Samuel Fellner was indebted to Lena Fellner in the sum of about $10,000, and that the- note in question, together with other notes and property, was assigned to her a® collateral security for the payment of said indebtedness; and she was authorized to-collect said notes- and apply the proceeds to the payment of the indebtedness mentioned. This does not constitute an absolute *519 assignment, but is -one made in trust for the payment of debts.

Our -statutes, -sections 3205 and 3206, Statutes of Oklahoma, 1893, provide as follows:

“Sec. 3205. One who -sells real property has a -special •or vendor’s lien thereon, independent of possession, for so much of the price as remains unpaid and unsecured, otherwise than by the personal obligation of the buyer.”

“Sce 3206. Where the buyer of real property gives to the -seller a written contract for payment of all or part -of the price, an absolute transfer of such contract by the seller waives his lien to- the -extent of the -sum payable under the contract, but a transfer of such contract, in trust, to pay debts and return the surplus, is not a waiver -of the -lien.”

The note in question, as -s-et out in the petition, constitutes a written contract for payment of all or part •of the price of real es-ta-te sold by the payee to the maker's of the note; and the assignment made an exhibit to the petition and introduced in evidencie only purported to ais-s-ign this note to- Len-a F-ellner as collateral security for the payment o-f -another debt dub from the payee to her, with authority to, collect -and apply the proceeds -o-n said debt. It is true that this note or -contract contained no provision requiring the assignee to return the surplus-; but it wa-s not necessary 'that this provision -should be inserted in the contract, if the conditions were such that the law would require such return. In all cases where property is assigned -as collateral -security for payment o-f another debt, the as-signee cam only take so much o-f the collateral as- may be neces-s-ary to liquidate the secured debt, and must in every instance account for and return the -surplus.

*520 We tbink tibe note as sued on, together with the written assignment, comes squarely within the terms of the provision of the statute .heretofore quoted, and that the lien of the seller was not discharged by the assignment of the contract to Lena.Fellner in trust for payment of his debts to her.

Thie trial court erred in holding that the vendor’s lien co-uld not be enforced in this proceeding. The question of the alteration of the note was a material question, If the note had Ween altered as claimed by the makers, then it was no such contract for the payment of purchase money for real ©state as would constitute it a vendor’s lien on its face; and it becamie important to determine whether such alteration had been made, and if so, by whom.

The plea of non est factum, duly verified, put in issue the execution of the note. The defendants offered evidence in support of their contention that the note had been altered; but the court excluded all such evidence, and took the case from the jury, and directed a verdict for the full amount of the note and interest. There was prejudicial error in this ruling. The question of the alteration of the note should have been left to the jury.

It is the policy of the law to allow no* tampering with written instruments,. and any alteration which varies the legal effect of the* instrument, change® the operation of the contract, or the rights or liabilities of the parties, though no fraud actually results, is a material alteration, and vitiates the instrument. The true test is, whether it is the same contract. (Johnston v. Nay, 76 Ind. 293; Wilson v. Hayes, 4 L. R. A. 196; and cases cited in the note. Ruby v. Talbott, arid notes, 3 L. R. A, *521 724; Moore v. Hutchinson, 69 Mo. 429; Palmer v. Poor, and notes, 6 L. R. A. 469; Saunders v. Bagwell, and notes, 7 L. R. A. 743; Walton Plow Co. v. Campbell, 16 L. R. A. 468; Citizens’ Bank v. Williams, and annotations, 35 L. R. A. 464; 2 Daniels Neg. Inst., sec. 1394; Lowe v. Argme et al. 30 Ga. 129; Warder et al. v. Wellyard, 46 Minn. 571; Lee v. Butler, 167 Mass. 426; Newman v. Uling, 54 Ohio St. 175; 1 Greenleaf, Ev. 568.)

In the light of the propositions contained in the foregoing, and those there cited, we have no doubt but the alteration here claimed is a material alteration, and the court erried in excluding the evidence -offered to show that such an alteration had bisen made.

The question of whether an alteration has been made -is one for the jury; but the materiality of this alteration is a question of law for the court.

Where th-e -execution of a written instrument is denied under oath, that is, where the genuineness of the signatures to such contract is denied, the burden is on the holdier to show that the alleged makers executed the note; but where it is admitted that the '.signatures are genuine, the presumption will be entertained that any and all alteration® appearing over such signatures were made before signing, and the burden of proof in such case will be upon the -one alleging the alteration, to sho-w that such alteration was made after the note was executed, and without th-e consent of the makers:.

The defendant offered such proof in this case-, but the court refused to permit,it to go to the jury.

The cause is reversed at costs of defendant in error, Tena Fellner, and new trial ordered.

*522 . Cause remanded with directions to proceed in accordance with the views herein expressed.