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The demurrer admits the facts pleaded in the answer, and for the purposes of the demurrer they are to be taken as true.
The law is well settled, that a mortgage given to secure a debt, and not the note or bond or other evidence of it, remains a lien on the mortgaged property until the debt is paid; that no change in the form of the evidence or the mode or time of payment, nothing short of acstual payment of the debt, or an express release, will operate to discharge the mortgage. The mortgage remains a lien *210until the debt it was given to secure is satisfied, and is not affected by a change of the note, or by giving a different instrument as evidence of the debt, or by a judgment at law on the note merging the original evidence of indebtedness. The State v. Lake, 17 Iowa, 215, 219, and cases cited; Jordan v. Smith, 30 id. 500; Davis v. Maynard, 9 Mass. 247; Brinkerhoff v. Lansing, & Johns. Ch. 65; Packard v. Kingman, 11 Iowa, 219; Chase v. Abbott, 20 id. 151; Haddock v. Bulfinch, 31 Me. 246; Morse v. Clayton, 13 S. & M. 375; McCormick v. Digby, 8 Blackf. 99; Hugunin v. Starkweather, 5 Gilm. 192; Burdett v. Clay, 8 B. Monr. 287; see, also, Sims v. Hammond, 33 Iowa, 368; Gregory v. Thomas, 20 Wend. 17.
The most frequent and familiar application of the principle is that a mortgage made to secure a promissory note will remain security for any new note given in payment or renewal of the former one, unless there is an intention to the contrary, and it has been held that the taking of a new note and mortgage to secure the same debt will not, even when the first mortgage is canceled, operate to discharge the lien of the first mortgage. Packard v. Kingman, supra; Smith v. Stanley, 38 Me. 11; Burdett v. Clay, supra. In Massachusetts where the taking of a negotiable note is held to prima facie payment of the debt for which it is given (which is different from the rule in this and most of the other American States), it is held that a new note, given in place of an old one which is secured by mortgage, unless intended as payment, is subject to the same security as the former note. Watkins v. Hill, 8 Pick. 522; Pomroy v. Rice, 16 Pick. 22; Bruse v. Nelson, ante.
The execution of the note sued on, at least to the extent of the amount of the old note, did not operate as a satisfaction or payment of the debt evidenced by the first note unless it was so agreed between the parties. It was not so agreed; on the contrary it is averred in the answer *211that it was understood and agreed that the lien of the mortgage should be preserved. The mortgage, even without any agreement, remained security for the debt it was given to secure, although a new note was given evidencing it with the additional sum of $500. Did the incorporation of this additional sum into the note (being a new loan) have the effect to • discharge the lien of the mortgage given to secure the first loan ? Most certainly not. Nothing short of payment or an express release would have that effect; at least this is so as between the parties and subsequent purchasers with notice. Now, such being the legal effect of the transaction in the absence of an agreement or understanding between the parties in respect to the continuation of the lien, it would be no less so under an express agreement in accord with such legal effect; nor does such agreement qualify or vary the written agreement expressed in the note. Indeed, the alleged agreement has respect only to the security, and not to the contract contained in the note. The allegation that defendant signed the note as surety only is the statement of a fact showing the relation in which the defendant stood to the other parties. The general doctrine that the relation of principal and surety, when known to the parties as existing at the time, although not expressed in the written contract, may be shown by parol evidence, is well settled, and amounts to nothing more than is also well settled with respect to the relation subsisting between the accommodation maker or acceptor of a note or bill and the party for whose accommodation it is made or given. Parol evidence in such cases is admissible to show that although the name of the defendant appears on the instrument as one of the makers he is in fact a mere surety who had signed at the request of another without consideration. Grafton Bank v. Kent, 4 N. H. 221; Warner v. Rice, 3 Wend. 397; Suydam v. Westfall, 4 Hill, 211; Griffith v. Reed, 21 Wend. 502; Wing v. Terry, 5 Hill, 160; *212Chambers v. Cochram & Brock, 18 Iowa, 159, and cases cited on page 165 ; King v. Baldwin 17 Johns. 384.
The admissibility of parol evidence to show the relation of principal and surety is within the rule that admits such evidence to show that the written instrument is void either for the want or failure of consideration, and this is no infringement of the rule excluding parol contemporaneous evidence to contradict or vary the terms of a written instrument. 1 Greenl. ón Ev., § 284. Evidence showing this relation, when it does not appear on the face of the instrument, is not in contradiction of the contract but collateral thereto. It is the showing a fact of which the parties had knowledge, and the existence of relations between them which imposed duties upon the party to be benefited by the contract of suretyship, which would not arise where the relation of surety does not exist; and it is the failure on the part of the beneficial party to perform such duties that may operate to discharge the surety from his contract;, but the contract, as expressed in the writing, is neither varied or contradicted by such evidence.
II. It is alleged in the answer that at the time of the execution of the note sued on, it was agreed by the parties that the mortgage should stand, and be held as security for the additional sum then loaned as well as for the amount of the previous loan, and that this agreement formed the only consideration for the defendants signing the note.
It was competent for the parties to make the contract alleged, and if it formed the only consideration for the making of the note by defendant Robbins, parol evidence is admissible to prove that fact, and also that the consideration has failed, when the action is by a holder with notice. Such evidence is ho infringement of the rule before referred to, excluding parol evidence to vary or contradict a written contract. 1 Greenl. on Ev., § 284.
The facts stated in the answer, if true, and they will be *213so taken on demurrer, constitute a full defense to tbe plaintiff’s action, for if tbe original payee held a mortgage lien for tbe same debt, for wbicb Robbins became surety, on property in value more tban sufficient to pay tbe debt, and voluntarily released such lien without tbe assent of tbe surety, tbe latter was thereby discharged, and this defense is available against tbe plaintiff who took tbe note with notice of these facts. See Chambers v. Cochran & Brock, supra, and eases cited on p. 166; 2 Am. Lead. Cases, 289, 290, and cases referred to in notes; King v. Baldwin et al. 17 Johns. 384; Carpenter v. King, 9 Metc. 511.
Tbe judgment of tbe court below is
Reversed.