Whether, under the circumstances of this case, plaintiff’s unfiled chattel mortgage, executed by the defendant Lee on the 9th day of April, 1890, is entitled to priority over a mortgage upon the same and other personal property executed subsequently by said Lee to the defendants F. H. Peavey & Co., and filed on the 3d day of May, 1890, is the principal question presented by this appeal which is taken by plaintiff from a judgment in favor of defendants for costs, and upon all the issues within the pleadings. The substantive facts are *72few, and as follows: Lee, who was the owner of a flouring mill and grain elevator, together with certain other buildings, situated upon the land of another, and used in the. business of manufacturing flour, and in the purchase and sale of grain and coal, entered into a co-partnership with Peavey & Co. on the 28th day of September, 1889, by virtue of which the latter subsequently advanced to the former $36,000 to be used in carrying on the business above mentioned, in the name of said Lee, but for the mutual benefit of the respective parties to said agreement, which, by its terms, might be terminated by either party upon 10 days’ notice to the other. The ownership of the above-mentioned buildings and appurtenances, the value of which was estimated at $25,000, was to continue in Lee, and all money advanced by Peavey & Co. was to remain their separate property during the life of the contract. After deducting 8 per cent annual interest from the profits of the business, tobe computed for the benefit of each party upon individual investments, as above indicated, the net profits of the business were to be shared alike between the parties; and the loss, if any, was to be likewise equally borne. On the 1st day of May, 1890, by consent of the parties, the contract between them was terminated, a final adjustment of accounts was had, and in settlement of an agreed balance tlien found to be due, according to the import of the written agreement under which the parties had operated, Lee executed and delivered to Peavey & Co. his promissory note for $20,000, payable on demand, and secured by a mortgage in which was included the property described in appellant’s previously executed, but unfiled, chattel mortgage, given to secure an existing indebtedness* of about $2,400. Evidently believing that Lee owned the ground upon which his buildings are situated, Peavey’s mortgage was, in the first instance, drawn upon a form applicable only to real property; but in order to accomplish what the parties intended, and make the incumbrance effectual, said mortgage and note for $20,000, payable on demand, were surrendered to Lee, who, in consid*73eration therefor, on the 3d day of May, 1890, executed and delivered to Peavey & Co. his promissory npte for the same amount, due 30 days after date, secured by a duly-executed chattel mortgage upon the property in question, which was immediately filed in the office of the register of deeds, and several days before the filing of appellant’s mortgage.

Sec. 4379 of the Compiled Laws provides that “a mortgage of personal property is void as against creditors of the mortgagor and subsequent purchasers and incumbrancers of the property in good faith for value, unless the original, or an authenticated copy thereof, be filed by depositing the same in the office of the register of deeds of the county where the property mortgaged, or any part thereof, is at such time situated.” While conceding that their client made no attempt to comply with the foregoing statutory enactment, and that Peavey & Co. were entirely ignorant of the existence of any prior mortgage upon the property, it is contended that appellant is entitled to priority because the debt to secure which the Peavey mortgage was given did not originate after the execution of appellant’s mortgage, and before the filing of the same, and that said Peavey & Co. are not ‘ ‘incumbrancers of the property in good faith for value.” By the terms of the contract the relation of debtor and creditor was not created by the advancement of funds by P. H. Peavey & Co. to respondent Lee with which to prosecute the co-partnership business. The $36,000 was at all times during the existence of the partnership the individual property of P. H. Peavey & Co., and at no time prior to the mutual cancellation of the partnership agreement, and adjustment of accounts, had they parted with the ownership of any part thereof. In settlement of their affairs, Lee turned over certain partnership effects, valued at $16,000, and gave his secured promissory note for $20,000, which stood for an unliquidated cash balance in his hands still belonging to his co-partners, but to the possession of which they were not entitled during the life of the contract. By an agreement thus based upon an accounting at the *74winding up of their partnership business, and at a time when Lee’s property, appeared to be clear of incumbrances, the relation of debtor and creditor between the former partners was created and F. H. Peavey & Co. became incumbrancers in good faith for value, without notice of appellant’s mortgage. In the absence of an allegation or proof of unfairness, or that the incumbrance was not for value, the presumption that the mortgage was executed upon a valuable consideration, and that the transaction was fair and regular, would doubtless prevail. . The burden in that respect being upon appellant, in order to recover it should have alleged and shown bad faith, or want of consideration. Ryder v. Rush, 102 Ill. 338; McCormick v. Leonard, 38 Iowa 272; Rogers v. Pierce, 12 Neb. 48, 10 N. W. 535. Moreover, by the surrender of the note, payable on demand, in exchange for one equal in amount, due in 30 days, Peavey & Co. parted with sufficient value, and extended the time within which payment might lawfully be demanded. This transaction alone imports a consideration, and is sufficient to constitute Peavey & Co. bona fide holders of the note and mortgage in question. Pratt v. Coman, 37 N. Y. 440, Port v. Embree, 54 Iowa 14, 6 N. W. 83; Gilchrist v. Gough, 63 Ind. 576; Burns v. Rowland, 40 Barb. 368. As upon both principle and authority, the record fully establishes F. H. Peavey & Co.’s right to priority over the unfiled mortgage of appellant, the judgment of the trial court is affirmed.