delivered the opinion of the court.
It is urged that there was not sufficient evidence of the loss of the bond to warrant secondary evidence of its contents. Whether sufficient proof has been given of the *561destruction or loss of an instrument to lay the foundation for admitting secondary evidence of its contents is a question resting in the sound discretion of the court. It is not necessary that proof of loss be beyond the possibility of mistake, but only to a moral certainty; reasonable proof; such as, according to the circumstances of the case, convinces the judgment that a T>ona fide search has been made and reasonable diligence and effort used in all places and from all sources and means of discovery which the nature of the case would naturally suggest, and which were accessible to him who offers the secondary evidence. It is not necessary that all the papers of a great office in which the lost instrument might reasonably be thought to be, be examined, but such files, compartments and places as the evidence shows it might in the course of affairs have been placed in, should be. Search in good faith must be made to appear. 1st Ed. Am. & Eng. Ency. of Law, Vol. 13, p. 1095; Carr v. Miner, 42 Ill. 179; United States v. Sutter, 21 How. 170-175; Miner v. Tillotson, 7 Peters, 99; Gathercole v. Miall, 15 M. & W. 319; Page v. Page, 15 Pick. 368; Viles v. Moulton, 11 Vt. 479; Taylor v. Clark, 49 Cal. 671.
“If a paper is shown to have been in particular hands, then the person must be produced into whose hands it has been traced; or if the natural and legitimate presumption is that it is in certain hands, then it must be proved by legal evidepce that it is not there, before secondary evidence of its contents is admissible. The evidence must satisfy the court that the paper is destroyed or can not be found.” Mullanphy Savings Bank v. Schott et al., 135 Ill. 655.
We see no sufficient reason for holding that the court improperly exercised its discretion in admitting secondary evidence of the contents of the bond.
Hor do we think that the commencement and prosecution to judgment of the suit against Cyrus M. Hawley only, was not a compliance with the conditions of the obligation. By giving this bond, to which there are no sureties, the obligors obtained leave, “ as the agents of Cyrus M. Hawley,” to go in and upon the premises of the obligee and remove a *562certain wall from which it was agreed future and further damages might result to her.
The recital that Marie M. Fenton was about to commence suit against Cyrus M. Hawley and others was not an agreement so to do, nor was a suit against others as well as against Hawley made a condition of the bond. A suit in trespass against Hawley and two irresponsible persons would have been a compliance with the language as to “others,” although a recovery as to Hawley alone, or no recovery against any one, was had.
The bond when accepted by the obligee amounted to a permit to the obligors “ as the agents and for Cyrus M. Hawley ” to go upon the premises of appellee and remove a certain wall, and was in effect an undertaking by the obligors that she should obtain judgment against Hawley for at least $2,000. The undertaking of the obligors was to, after the termination of the suit against Hawley, “immediately upon demand, pay to her or her attorney the sum of $2,000, and the cost of said suit,” if the suit against Hawley should fail or the judgment therein be less than $2,000; a judgment for less than $2,000, to belong to them upon payment of such $2,000.
The rules applicable to sureties are not controlling in a •case where all are principals, and the obligors have received —not a mere nominal consideration, or none at all — but an ¡actual, and as they deemed, adequate reward.
It is urged that the rule as to promissory notes payable upon demand is applicable to this undertaking. The distinction between debts and notes payable on demand and the obligation under consideration is, that in case of precedent debts payable on demand the amount of the same is fixed and known when the undertaking is made; that this sum will have to be paid at some time is also knowm.
Whether the obligors in the present case could ever have anything to pay, as well as, if anything, how much, and when, were things which, at the making of the bond, nobody knew. So as it appears the first that the obligors knew that the suit against Hawley had resulted in a judgment against him was when suit was brought against them,
*563If without demand the present suit was, under such circumstances, maintainable, it follows • that had obligors, upon being sued, gone at once and paid the $700, they must also have paid the costs of this suit up to that time incurred.
The position of appellee is that obligors defaulted in the payment of $700, so soon as judgment against Hawley was had, without notice or knowledge that any judgment against him had been rendered; and that consequently, without notice or demand, they can be cast in costs.
When a party promises to pay his own debt on demand, a suit is a demand; when his undertaking is to pay if a certain thing happens, neither the amount to be paid, nor the time when payment, if ever, will be due, being known, and the happening of the event upon which payment depends lies peculiarly in the knowledge of the obligee, demand of payment is necessary before the bringing of suit. Nelson v. Bostwick, 5 Hill (N. Y.) 37-42; Watson v. Walker, 23 N. H. 471; Whitton v. Whitton, 38 N. H. 127; Dix v. Flanders, 1 N. H. 246.
There not having been a previous demand, appellee was not entitled to maintain this action. Only for the error of law in this regard is the judgment of the court below reversed without a remandment of the cause.
The judgment of the Superior Court is reversed.