The facts show that the defendants have received payment for the cattle; that the plaintiffs, who paid them, have not been paid either for their services and advances or for the price of the cattle, less the amount of their advauces and services.

Upon the trial, it was insisted, by the defendants, that the transaction of rendering the bill and giving the.cheek constituted, in law, a complete defence to the action ; that these documents showed conclusively that the plaintiffs had agreed to resort to Lauterback for payment for the cattle; that they had sold him the cattle as their own, taking the risk of his solvency, and had paid the defendants absolutely, and not conditionally, and that parol evidence was inadmissible to contradict the import of the papers.

That such is their natural import is not to be disputed. The bill, states that plaintiffs had sold for defendants the cattle for $1824; that the plaintiffs had deducted out of that sum $517, for advances and. services, and that there remained, after allowing, overcharge on commissions of $19, thirteen hundred and twenty-six dollars, which had been paid by plaintiffs’ check to defendants.

The plaintiffs undertook to overthrow (his documentary evidence, and to show lliat the cattle, by express agree*341ment between plaintiff’s and defendants, were .sold on time, t’ne defendants undertaking to assume the risk of Lauterbaok’s solvency; that they never agreed to guaranty the sale to defendants; that at the time of the settlement, and when the cheek was given, the plaintiffs, at the request- of defendants, and for their accommodation, agreed to advance to defendants what would be duo from Lauterbaek, collect the Lauterbaek checks, and out of them reimburse themselves, if they were paid, and if not, that defendants should repay the advance.

The cause evidently turned much upon the conclusiveness of these papers, whether they were only evidence of what they purported to mean, liable to. be disproved by counter testimony, or whether they absolutely estopped the parlies by force of the rule, that parol evidence is not competent to vary the terms of a written contract.

The court below held the papers were mere evidence, open to explanation by testimony showing the true character of the transaction.

The check and bill, together, were said to make the contract in writing. The check, alone, could not constitute the contract; it had no such meaning, except when read in connection with the bill and aided by such inferences as the defendant needed to complete his defence.

The rule excluding parol evidence to alter or control the interpretation of a written contract, only applies when the entire contract has been avowedly put in writing by the parties, where they have unmistakably declared the writing to bo the record of their intentions. It cannot relate to written memoranda not signed by the parties, not purporting to be a contract, but mere evidence in writing from which a verbal contract may be inferred, which the parties have not reduced to writing.

“ When parties have deliberately put their engagements into writing in such terms as import a legal obligation, without any uncertainty as to the object or extent of such engagement, it is conclusively presumed that the whole *342■engagement of the parties, and the extent and manner of their undertaking was reduced to writing, and all oral testimony of a previous colloquium between the parties, or of conversations or declarations at the time when it was completed or afterwards, as it would tend, in many instances, to substitute a new and different contract for that really agreed upon, to the prejudice of one of the parties, is rejected/ •Such is the rule, as clearly and precisely stated by Greenleaf, in 1 Greenl. Ev. 275. It is to be observed that, by this statement of the rule, the writing must import a legal obligation, without uncertainty as to the object or extent of the engagement.’

Was there any such written contract in this case? If so, what were its objects and extent?

The amount of the plaintiffs’ claim has never, in point of fact, been paid; but the defendants insist that the plaintiffs have, by a contract in writing binding upon them, so far admitted payment as to be precluded from recovering in this action.

The plaintiffs have not executed any release under seal; they have not even signed a receipt in writing.

They have delivered a statement in writing of an account between them and the defendants, in which this claim is deducted from the amount for which certain cattle were sold; they have not, even in express terms, admitted that at the time the check was given they had actually received the money for the cattle. The non-receipt of the money is perfectly consistent with the statements of the account.

For does it import a legal obligation resting upon the plaintiffs to pay the balance of the account. It is a statement showing the balance that would remain after deducting from the price of the cattle the account of the plaintiffs, and that such balance had been paid or advanced to ihe defendants by plaintiffs.

The allegation of the plaintiffs was, that this balance was not in fact due from plaintiffs to defendants; that *343they merely undertook to receive it for them of Eautorback, and in the meantime, for their accommodation, advanced them the money. Neither the account delivered, nor the account and check taken in connection, constitute any written contract certainly showing that such was not the agreement of the parties. The defendants do not insist that the whole agreement between the parties is contained in the check and account rendered ; they offered to show, and did give evidence to that effect, that they were not the whole agreement. Where part, only, of a contract has been reduced to writing, and it so appears by the writings, and the verbal contract was entire, it may be proved by parol. Lewis v. Gray, 1 Mass. 297; 1 Greenl. Ev. 284. If the plaintiffs, instead of giving their check on their bankers- for this balance, had taken the money out of their drawer, and paid it over directly to defendants, upon their promise to reimburse it in case the Eauterback checks were not paid, and also pay the amount of the account, the transaction, in all its essential features, would not have differed from that now before the court, instead of handing over the money in person, they gave a written direction to their bankers to do it. What became of that direction is a matter immaterial, for two reasons: first, because the money to recover which this suit is brought was not in any way included in that check; secondly, because a check on a banker does not conclusively, as between the parties, import a precedent indebtedness to that amount in payment of which the check was given. This appears from the simple consideration that, if the plaintiffs had lent to the defendants, in a way entirely disconnected with the transaction, a sum of money, and paid it by check, instead of in cash, in an action for tliis borrowed money, the check would not have been conclusive evidence that it was a debt, not a loan. When one gives his check to another upon his banker, the prima facia presumption is that it was for money due, but the contrary may always be shown cither by *344written or parol evidence. The check, on its face, is a mere order to another to pay money; it docs not, by its terms, settle the question whether the money is to pav a debt or is a loan. The presumption that it was tor a debt, arises, like many other presumptions, from the ordinary course of business; it. puts tlie party to show that inhibe case in hand the ordinary course of business was departed from. Neither the account alone, nor the account and check together, or both in connection with the fact that the plaintiff had the checks of Lauterbaek, raised any conclusive presumption. And the court below did right in refusing to instruct the jury, as requested by defendants’ counsel.

Whether the plaintiffs made a final settlement, and paid to the defendants the balance, and agreed to look to Lauterback for reimbursement, was a matter to be settled by the jury ; and, in settling it, the evidence of the parties present at the time the chock was given, and the bargain with the plaintiffs made by defendants, was perfectly competent.

The question whether, in an action brought by the defendants against Haring & Go. upon the checks given by them to the defendants, it was competent to show that the check was accommodation paper, and that no value had been received for it, was immaterial in this case; and even if the court were wrong in the views expressed to the jury upon that point, the judgment should not for that reason be reversed. An erroneous direction upon a point not Involved in, the case cannot be ground for reversing the judgment. If the court did right in instructing the jury that the check was not conclusive against the plaintiffs, it matters not what reason was assigned for this decision. The views already expressed dispose of the sixth, ninth, tenth, eleventh, twelfth., fourteenth, and fifteenth exceptions to the charge of the judge. ,

The thirteenth exception is founded upon the refusal of the court to charge the jury that, the account having been *345rendered, and the check given by ITaring and tiie plaintiff’s having given no evidence of any account rendered, or information given to the defendants that, Lauterback had failed, and the plaintiffs still retaining the checks, and never having tendered them to the defendants, and the agents, in this particular, having been guilty of neglect for an unreasonable time, the defendants have a right to charge the plaintiff's lor the price of the cattle, either as for money had and received for the nse of the defendants or for chattels sold and delivered to the plaintiffs.

Was the instruction prayed for right? Did any or all the circumstances combined create a legal liability for the Lauterback checks ? The court was asked to charge that they did. We observe that the defendants did not ask the court to charge the jury that if they believed, from the evidence in the cause, the plaintiffs undertook, as agents for the defendants, to collect the cheek of Lauterback for them, that the plaintiffs were bound to use reasonable and due diligence in so doing; and that if the jury believed, from the evidence in the cause, they had neglected their duty in that behalf, and had failed to use duo diligence in presenting this check for payment, and to notify the defendants of the default of Lauterback in making payment, and by reason of these defaults the defendants had lost the amount of the checks, that these defendants were entitled to retain the amount of the cheeks.

The court was asked to charge, as matter of law, that the plaintiffs had made themselves liable for the cheeks. An agent is not liable to bis principal for default in his agency, unless the principal sustains damage by reason of such default and negligence, and then only to the extent ,of the injury received. The loss must be a real loss of actual damage, and not merely a probable or possible one. Delaney v. Stoddard, 1 T. Rep. 22; Webster v. Le Tastet, 7 T. Rep. 157; Paley on Agency 19, 21, 75, 76; Story on Agency, §§ 217, 222.

*346The facts stated in this request do not show conclusively that defendants sustained any loss. It would have been incumbent on the defendants, if they had brought an independent action against plaintiffs, to have shown that the plaintiffs were agents of the defendants for the collection of the check; that they had failed to make proper efforts to collect it, and if they had done so that it would have been collected. The court might properly have left it to the jury to say whether the defendants had not, by keeping the checks so long without advising the defendants, shown an election to keep them as their own property, and not look to the plaintiffs for reimbursement. But no such request was made. The proposition asserted by defendants’ counsel was not true as matter of law, and the court was not bound so to charge.

The fourth exception was to the charge of the judge, in that he stated to the jury that the remaining question was, have the plaintiffs been refunded their money, or paid their commissions; the money for freight and carpenter’s bill having been advanced by plaintiffs for defendants, at their request, aud the commissions having been earned.

The remaining question truly was, had the money been refunded—the commissions paid either in fact or in law. This statement of the question, taken in connection with the other parts of the charge, did not mislead the jury; they were not told that the plaintiffs must recover unless the defendants proved an actual payment of this claim in money. The submission to the jury of the question whether there was a special contract for a sale of the cattle without guaranty, and whether the plaintiffs’ check was a final settlement of the transaction or not, fully explained what the court meant by this statement of the question.

The fifth exception is, that the court misstated the fact to the jury, in saying that the plaintiffs’ check was protested. This cannot be assigned for error; and if it could, *347the statement of the judge was correct—the check and protest, had been offered in evidence.

The seventh exception was to that part of the judge’s charge, in which he stated “ that Haring’s check was protested on the first of September, and the presumption was that the parties defendant got notice of it ; and in the absence of any affirmative or negative proof, it might fairly he presumed that notice was sent to all the parties interested. If the holders had notice of the dishonor of the Lauterback checks, it was fair to infer that they had informed the defendants of the fact.”

The defendants had negotiated the Haring check, and were never called upon to take it up; it was collected of Haring by the holders : it could not have been material in the cause whether the defendants had or had not notice of the protest of the check.

But the plaintiffs held the Lauterback checks; they were not paid, and the charge of the judge was, “ that it was a fair inference that, if the plaintiffs knew of the dishonor of the checks which they themselves held, they had communicated that knowledge to the defendants.”

Whether this instruction was correct or not depends upon • the solution of the question whether, in that action, or any - phase of it, it was incumbent upon the plaintiffs to show notice to the defendants of the dishonor of the Lauterback checks. This subject has already been partially examined; but it will be necessary to return to it again, as the aspect in which it is now presented differs from that in which it was - first viewed.

If the plaintiffs held these checks as their own property, it mattered not whether they communicated notice of their dishonor to the defendants or not. But if they took them as the agents of the defendants for collection, they were bound . to do something with them—to present them for payment; and if payment was refused, to notify their principals in a reasonable time; and if’any injury was sustained by reason of their neglect to do so, they were liable to make it good to their principals.

*348It is manifest- that if under any circumstances the plaintiffs might in this action have been charged, with these checks, on account of their conduct in regard to them, either as having, by retaining them so long without notice, manifested an election to keep them as their own, or by reason of neglect in their duty as agents, it became important whether notice of non-payment had been sent by plaintiffs to defendants.

The circumstances under which they took these checks, adopting the plaintiffs’ own view of the case, were very peculiar. The plaintiffs allege they sold the cattle without guaranty; that they did all their duty as agents, and were entitled to payment for their services and advances; that it was defendants’ duty to collect the price of the cattle from Lauterback—that with that they had no concern; that defendants resided at the West, and could not well collect the checks; that in order to enable them to return home, the plaintiffs agreed to advance the money, as an accommodation, or loan, to the defendants; that by an arrangement made by consent of all parties, Lauterback’s checks for the whole amount were to be made payable to plaintiffs; that they were so made, and delivered to them, being the only evidences of debt given for the purchase of the cattle; that these checks were accepted as conditional payment and settlement of plaintiffs’ claim; that they gave to defendants their check for the balance. If the Lauterback checks had been paid, the 'whole transaction would have been closed —the plaintiffs’ claim on defendants at an end. By the giving of those checks, Lauterback had agreed to become the debtor of plaintiffs for the price of the cattle; the plaintiffs held negotiable securities for that price, and so long as these were outstanding the defendants could not recover of Lauterback.

It is not fair to consider the collection of the checks as a mere isolated, independent transaction subsequent to the settlement between plaintiff's and defendants. They were taken as a part of the settlement between all the parties, *349as a conditional payment to the plaintiffs for their check and claim. If the checks were not paid, according to the plaintiffs’ theory of the ease, they were at liberty to bring an action against the defendants for the amount of their check, when paid, for money lent to defendants, and also for their services and advances, or to treat the checks as money, and retain them for their own use, and look to Lauterbaek for ultimate payment.

The defendants might show this upon the trial, either by express evidence that they had so agreed, or by proof of such conduct on their part, such treatment of the checks after their dishonor, as would satisfy the jury that they had so agreed.

If the plaintiffs had designed to retain the checks as their own, they would not deem it necessary to inform the defendants of their non-payment, or endorse them and send them to defendants as the evidence of their claim against Lauterbaek.

The defendants were entitled to have the decision of the jury On this point; if in their favor, it was a complete answer to the plaintiffs’ action.

In this view of the case there was no fair or legal presumption that the plaintiffs had ever notified the defendants, in writing or otherwise, of the non-payment of the checks. There was equal reason for the presumption that they had endorsed the checks and delivered them to the defendants. There is no legal ground upon which such presumptions can rest.

For this error in the charge of the court the judgment of the Circuit Court must be reversed.

This was an action, brought in the court below, by Miller & Co. v. Park & Co., to recover $ 150 for so much freight paid by them on the cattle of Park & Co.; also the further sum of $38 for commissions, at $1 per head, for selling said cattle, and also $10 for food for the same, all for $498.

*350Park & Co. pleaded payment, and gave in evidence the following paper, in the handwriting of the plaintiffs, and made out and delivered by them to the defendants at the time of its date.

New York, August 21st, 1855.—Messrs. Miller, Haring <& Co., sold for Comstock & Park, 38 cattle, at $48............................................ $1,824.00

Dr.

Freight.......................................... $450.00

Commissions............ 57.00

Carpenter’s bill................................. 10.00

--517.00

$1,307.00

Add........................ 19.00

Samuel D. Haring’s check, due August 29th........$1,326.00

To balance.................................................. 1,326.00

It is also conceded that the check named therein was also delivered by the plaintiffs to the defendants at the same date. This is prima facie evidence that this claim of the plaintiffs had been paid. At the time of their sale of the defendants’ cattle by them on commission, they make out an account, crediting the defendants with the proceeds of the sale, and charging them with the freight, commissions and provisions, and their check to balance, thus admitting, upon the face of the account, that they had received the amount of the sales of the defendants’ cattle, and claiming that they had paid it over by the account for freight, commissions and check.

This throws upon the plaintiffs the burthen of proving that there was error or mistake in this account rendered. They undertake to do so by attempting to prove that the sale of the cattle by them was, with the consent of the defendants, upon time and at their risk; that the money *351was lost by the insolvency of the purchaser; that the check was given merely to accommodate the defendants, and to be repaid if the money for the cattle was not collected.

Among other evidence offered by the plaintiffs to prove that the sale was at the risk of the defendants, the following questions were asked : 1st, were the plaintiffs in the habit of making different entries in their books in case of guaranty and not guaranty? 2d, what was the difference? which were severally excepted to, but which, under the permission of the court, were answered as follows : yes, they made a different entry; whenever a sale was made that was guarantied, it was so entered on the book. These questions and answers were objected to as incompetent, illegal, and rrelevant.

1 think this evidence was illegal for several reasons—

First. The question before the jury was, did or did not the plaintiffs guaranty to the defendants the proceeds of this particular sale? This could not be proved by the habit of the plaintiffs with regard to other sales, in fact, much less by proving their habit of entries in their books.

In the second place, even if the plaintiffs could prove that they' did not guaranty this sale by proving that they did not guaranty other sales, this was not the legal mode of proving it. They were proving a certain habit of entering in their books. They do this by proving what a person has seen in their books, not by producing the books themselves. The best evidence of this habit was certainly the books themselves. Upon every principle relating to the admission of evidence, this was much more objectionable than parol evidence of particular items. It is only proving the contents of the books by wholesale, instead of by retail.

In the state of the evidence before the jury upon this material allegation, that the plaintiffs did not guaranty the sale, we cannot say that this illegal testimony did not *352materially influence their decision. I think, under the circumstances, very probably that it might.

Without considering the other exceptions, the judgment below should be reversed

The Chief Justice concurred.

Cited in Crane ads. Elizabeth Library Ass’n, 5 Dutch. 306.