This is an action of covenant, brought by the defendants in error, as executors of B. Warner, against Thomas Aldridge. The declaration sets out, that on the thirtieth day of Dec. 1820, by a certain agreement between the said Thomas Aldridge, and the plaintiffs’ -testator, the said Thomas Aldridge, by re^ ference to a memorandum at the foot of said agreement, acknowledged himself to be indebted to the said *95B. Warner in tire snm of one thousand fonr hundred «and thirty nine dollars and twenty nine cents ; to secure which, the firm of Aldridge, Myers & Pendle-ton, assigned to the said B. Warner, a number of bonds, which are set out in the agreement, and reci:ted in the declaration; amounting in all, to the sum ■of one thousand six hundred and eighty nine dollars thirty eight cents, exclusive of interest; that the said Aldridge covenanted with the said B. Warner, that in case a full suificiency should not be made to discharge said debt and interest, then said Aldridge ■should make good the deficiency. ■
The plaintiffs further aver, that a “ full sufficiency was not made out of the claims assigned; that -certain claims (setting them out) were insolvent at the -time-of the assignment; that certain others (also setting them out) became so in a short time after the transfer, and that nothing could be made out of them; and that on the 20th April, 1831, there remained ;due, after allowing all that had been collected, one ■thousand dollars and fifty three cents, which is alleged still to be due, of which the defendant had had ■notice. The declaration avers, that the plaintiffs have, in all things, kept their covenant; and charges the -defendant with a breach on his part, in not having .paid the sum of one thousand dollars and fifty three ■cents, above stated, according to his covenant to pay said deficiency.
To this declaration, the defendant pleaded in short, “ covenant performed,” and the plaintiffs subjoined “ replication and issue,” which are all the pleadings that appear in the case. It appears there was a previous declaration, to which there was a demurrer, which was sustained, and the plaintiffs had leave to file an amended declaration.
At the trial of the cause, below', the plaintiffs prov*96ed by the transcripts from the Courts in Virginia, where the defendant lived, that suits had been prosecuted on all the bonds, not collected, except two ; and that he had used due diligence to collect the same; that as to those two, he proved by the deposition of one L. Thompson, that they were notoriously insolvent, at the time of the transfer, which fact, he proved, was well known to the defendant: he also proved by said Thompson, that the fact of the insolvency of several of the obligors, was also known at the time of the said transfer. The testimony of Thompson was objected to, on account of his want of competency, he having signed the covenant. It appears that he signed it as attorney at law, and received-the claims to collect, as attorney of Warner. The plaintiffs also proved by one Tarver, that at the end of 1831, or beginning of 1832, he, as the agent of the plaintiffs below, gave the defendant notice of the failure to collect a large part of the claims assigned, and that there was a deficiency to satisfy the debt. No other notice, it was admitted, was proved. The defendant objected, that this was not sufficient notice to fix the defendant’s liability ; which objection was overruled.
The defendant moved the Court to instruct the jury, “that before the plaintiffs could recover for a deficiency, if on account of insolvency of the obligors in the assigned bonds, that the plaintiffs should tender to the defendant a return of the notes or bonds declared insolvent, or offer to transfer to the defendant the judgments recovered thereon;” which instruction the Court refused to give. He also requested the Court to charge the jury, “ that before the plaintiffs could recover, they were bound to show that they had, withi n a reasonable time after the assignment of the bonds, made application to the obligors in said bonds *97for payment, and that said defendant had - notice of their refusal, within a reasonable time thereafter; the evidence of the transcripts of the judgments, which it was admitted were sued ‘on in due time, and that of Tarver, above stated, being all that was given to the jury ;” which instruction the Court refused to give. To these opinions of the Court as above stated, exceptions were taken below, and which are assigned for error here.
The objection to the competency of Thompson, was properly overruled. The instrument sued on, appears to have been intended to answer the double purpose of a receipt, by Thompson, as attorney, for the ■collection of the bonds transferred, as an assignment -of the bonds to Warner, and also to set forth the covenants between Warner and Aldridge; and; ad the foot of the instrument is a statement of what Aldridge was indebted to Warner. The assignment to Warner, to pay the debt due him, made him the legal holder of the bonds, and the implied covenant of diligence, in the collection of them, Avas thereby, fixed upon him. There is no. undertaking of Thompson to Aldridge: his liability is to Warner, and he Avas no doubt liable to him for the faithful discharge of his duty. But he has no direct interest in the result of this suit, and it cannot be used for or against him in any action which may be brought on his receipt. He was the agent of Warner, in the collection of the bonds; and ex necessitate rei, is a competent witness to show what was the result of his efforts.a If this were an action against Warner, for the alleged negligence of Thompson, he would be excludedb — but this not being the case, the objection only goes to his credibility, and not to his competency.
Before entering upon an examination of the other questions, presented by the bill of exceptions, it will *98be proper to look at the state of the pleadings in the case. The covenants contained in the instrument sned on, are clearly dependent: they are treated as such by the plaintiffs. An averment of diligence is made in the declaration, as to the efforts to collect the assigned bonds, and the defendant, had he chosen to do so, might have put the fact of diligence in issue. But the only plea put in by him, is, that of “ covenant performed.” He does not plead the non-performance by the plaintiffs, of the condition precedent.
There is no plea of the general issue in the action of covenant. The plea of non est factum, only puts the execution of the instrument in issue, and all other defences in this action must be pleaded specially.a If the defendant had intended to have relied upon the negligence of the plaintiffs, in not collecting the assigned bonds, that should have been set out in a special plea, setting forth particularly, in what that negligence consisted. The plea of covenants performed, only denies the truth of that part of the declaration, which charges the defendant with a breach of his covenant, in not making up the deficiency.- The plea, if written out in full, would have stated that the plain-liffs ought not to recover, because he, the defendant, had paid the deficiency claimed in the declaration, and would have concluded to the country,b and this plea does not require the plaintiffs to prove diligence.
Whatever may have been the view, taken by the parties in the trial below, this Court can only look at the case here, as it is presented by the pleadings, and the rules of law applicable to those pleadings. The question presented by this plea, is, whether the defendant had paid the deficiency charged; not, whether the plaintiffs had neglected to prosecute with diligence, for the collection of the notes. In this view of the case, it will be apparent, by a. reference to the *99bül of exceptions, that none of the charges asked and refused, were applicable- to the issue, "as made. What might have made them material, it is not for this Court to decide. And though the plaintiffs may have offered evidence which is not material to the issue, yet that does not authorise the defendant to call upon the Court for instructions upon that evidence; and its refusal to give them cannot be assigned as error. It is sufficient for us, that the issue does not present the question, upon which the instructions are asked.
It is remarked, by Mr. Justice Livingston,a “ that however desirable it may be to admit in evidence on the general issue, in an action of covenant, on a policy of insurance, every thing which may avoid the contract or lessen the damage, as is done in actions on the case, this Court does not know that it possesses the power of changing the law of pleading, or to admit evidence inconsistent with the forms which it has prescribed. No rule on this subject is more indexi-ble, than, that in actions on deeds, all special matter of defence must be pleaded.”
In the case under consideration, the questions asked, if granted, would have allowed the defendant to set up the fact, that he had never been liable to pay that, which he had averred that he had paid. It is not, however, to be understood, that the instructions asked, in this case, would have been proper to be granted, under any state of pleading. They do not, any of them, directly raise the point of diligence, which, under any possible state of pleading, would be the only defence the defendant could make.
The judgment must be affirmed. In this, the Court are unanimous; though they are not so, upon some of the views presented in this opinion.
1 Starkie, 113
Starkie, 115
1 Chitty's Pl. 482.
3 Chitty 1002
Cranch, 219