The opinion of the court was delivered by

Three errors have been assigned in this case. They, however, embrace but two. questions. First, Was the court below right in rejecting the evidence offered by the plaintiff in error who was the defendant below ? And second, Did the court charge the jury correctly on the claim of the plaintiff in error to be allowed to defalcate the debt owing to him by his son Adam Jenner Ankrim, from the claim of the defendants in error, who sued as trustees appointed under a proceeding by writ of domestic attachment against the son, according to our acts of assembly made in that behalf*?

On the first question, it appears that the evidence rejected by the court, was offered for the purpose of showing a treaty or negotiation between the wife of the plaintiff in error, as bis agent, and their son Adam Jenner Ankrim, upon the eve of his removing to a distance, relative to his giving up a store of goods, of the value of from twelve to fifteen,hundred dollars, and his books of account connected therewith, to the father, the plaintiff in error, that he might manage and make the best of them, and secure to himself by means thereof a debt of about eighteen hundred dollars, whicbChe claimed that the son then owed to him. It was testified by one of the daughters of the plaintiff in error, that the son on his going away delivered to her the keys of the store, with a request that they should be given to his father, and to tell him to manage it in his own way; or to make the best of what was there. That she did do so, and that on the next morning thereafter, the father took possession of the store and books. It was also further testified by the son himself, in his deposition which had been taken under a rule of the court and was read in evidence, that on his going away he delivered the keys of his store to his sister, for the purpose of delivering them to his father, that he might convert the effects in the store to the discharge of *350the debt already mentioned; to the existence of which he also testified.

It appears to me, that the testimony rejected by the court below, was not only pertinent to the issue, but competent and admissible under any view that can be taken of it. If the mother, on behalf of the father, either with or without authority from the father, proposed to the son to give up his store, and his books containing an account of the outstanding debts owing to him for goods sold out of the same, in order to secure to the father the debt which he owed to him, and the son assented to it, it would certainly tend to confirm and explain more fully the object of the son’s giving up the keys of the store afterwards. And the father’s subsequent acceptance of the keys, might well be considered by the jury as equivalent to an assent on his part to the terms and conditions upon which the keys were originally proposed to be delivered by the son, as well as a confirmation of all that had been said and done by the mother in bringing about the giving up of the store, &c.; of which the handing over of the keys would be a good symbolical delivery ; for, omnis ratihabitio retro trahitur et mandato cequiparatur. Or suppose that the son did not give his assent at the time of the proposal made by his mother, bat had said to her, he would consider of it, and on the next day following, or so, had delivered the keys in the manner testified to by his sister, might and ought not both in fairness to be considered as parts of the same transaction, the latter as an execution of what had been proposed the day or two before ? It seems to me, that the whole in such a case ought to be submitted to the jury. This, in substance, was the nature of the evidence offered by the plaintiff in error, and rejected by the court. It is said, it was not admissible because it related to what had taken place prior to, and at a time different from the delivery of the keys, and cannot therefore form any part of the agreement, even if there were one, under which the keys were delivered; nor yet lead to any certain conclusion with respect to the nature and extent of it. This objection perhaps might in some measure be applicable, if the agreement alleged to have been made in this case had been committed to writing, and signed by the parties. Because, where the agreement of the parties on the subject is committed to writing, the rational as well as legal presumption is, that every thing ultimately agreed on by them, is inserted in it. So that in the course of their treaty, certain things may be agreed on, which afterwards, when they come at the close of their negotiation to put their final agreement in writing, are by consent modified, changed, or left out altogether as forming no part of it, And wherever any thing has been so previously agreed on, which does not appear afterwards to be in the writing, the presumption is that the parties by the last act of their minds on the subject, resolved that it should not be part of their agreement, and therefore left it out of the writing. Hence in part has arisen the general rule, that nothing which tends to alter, contradict or vary what is contained in the writing can be given in evi*351dence, unless it be also proved that it was left out of the writing by fraud or mistake. It may also be observed, with respect to written agreements, that the signing and delivery thereof is the consummation of them, which reduces their execution to a single point of time, and every thing that has been agreed on, within the compass of the writing, beyond which we are not to look. It is very different, however, in regard to oral agreements, which must be collected sometimes from various conversations and acts of the parties, had and done at different times.

From a circumstance which has been mentioned, of the father and son’s not being on speaking terms at this time, the son possibly conscious that he had not treated his father and his advice with due respect, there is perhaps some reason to believe, that no formal and express agreement in detail was really entered into, under which the keys were delivered up: yet, it cannot be doubted,, but that they were given up for some purpose, and upon an understanding and agreement of some kind. That being the case, this understanding and agreement must, as is frequently the case, be collected and obtained from previous conversations and subsequent acts on the subject. Those previous conversations and interviews must in every case of the kind be considered as having led to and caused the subsequent acts, when they cannot be accounted for but by referring them to those previous conversations: and the whole, when taken together, may develope pretty fully and clearly the design and intention of the parties, which is all that is desired in such cases.

Another objection is, that it being only evidence of what the son, Adam J. Ankrim said to his mother, and he being a competent witness in this case for the father to prove it, it is therefore mere here-say to every other, and cannot be proved by any other than the son. This objection is founded upon an entire misapprehension of the true character and nature of the evidence. It is not what is properly called hearsay: neither is it evidence of a secondary character, as has been again alleged against its admissibility. It was offered for the purpose of proving an oral agreement, to which the son was a party. Now it is only by giving evidence of the declarations and acts of the parties to such an agreement, that it can be established: and third persons who were present, heard what was said, and saw what was done, are introduced and brought into court every day to testify to all they heard and saw upon such occasions. Their competency, and the admissibility of such testimony has never been doubted, where the parties to such agreement are also the parties to the suit in which the witnesses are called to testify. As the great object of adducing testimony, is to arrive at the truth, in order that justice may be administered, it is difficult to imagine why the change of parties to the suit should render a change of witnesses necessary, to prove the truth of the same facts, as long as they are not of the parties to the suit, nor interested in the event of it. The agreement consists of what is said and done upon such occasions, and third per*352sons who were present, hearing and seeing all that was said and done» are just as capable of relating it intelligibly and truly, as the parties or either of them would be; and sometimes much more worthy of being relied on for truth and accuracy. Whether an oral agreement was made or not; what were the terms and conditions of it, and who were the contracting parties, are matters of mere fact, which must be proved as other facts are; that is, by witnesses who were present at the making of the agreement, and heard and saw all that was said and done in respect to it. Mr. Starhie, in his Treatise on Evidence, part iv. page 81, says, “ an oral contract may be proved by any witness who was present at the time, or who heard the defendant admit the existence of such a contract.” And according to the doctrine laid down in Gibblehouse v. Stong, 3 Rawle, 437, I can perceive no good objection that could have been made to the plaintiff in error’s having given in evidence the admissions of his son made at any time before the issuing of the writ of domestic attachment, showing that he had given his father the store and books of account, towards securing the debt which he owed to him; or any other admissions of the son, going to show that he had put his father in possession of the goods to dispose of them; and of his books to collect the money due on them. Any one not interested in the suit would have been a competent witness to have proved such admissions, who was present at the time and heard them made.

It has also been contended, that as the son’s deposition was taken by the father, and he has testified to nothing having passed between him and his mother on the subject of the store and the books of account and the giving of them up to his father for any purpose whatever, that no other person can therefore be resorted to by the father as a witness for this purpose. There is nothing in this objection. The son is no more competent to prove this matter than any other who was present at the time: and every other person present, with the exception of the mother, is just as competent to prove it as the son. If a party has two or more witnesses by whom he can prove various facts, that is, all these various facts by each witness, he may call up one of them, and after getting his testimony as to some of the facts only, may forbear to examine him further as to the remaining facts; and if the witness does not in compliance with the obligation of his oath, declare as he ought his knowledge of them, the party calling him may dismiss him without it. But who ever heard before that by doing so he had put it out of his power to prove these remaining facts by any other witness 1 It cannot alter the nature of the case, that the witness so called was so connected with the remaining facts, that if true, he must have known their existence, unless perchance they had escaped his recollection. It was perfectly immaterial in this case whether the plaintiff in error called his son to prove any of the matters which he offered to give in evidence. They are all such as might be proved by any other. He was therefore not bound to call his son for such purpose if he had been standing by him. Any *353otb'er person present at the time the thing took place, of which evidence was offered to be given, was as competent as the son, and therefore the father was at full liberty to exercise his own will in 'this particular. It is not like the case of subscribing Witnesses to a written contract or will, who, if within the jurisdiction of the court where the existence of such contract or will is controverted, must be first called by the party Wishing to establish the instrument; and until he has first calle'cl and examined them fully touchihg the execution of it, he cannot call any other witness : if, however* he fail to prove the execution by the subscribing witnesses, he may then call others. The reason for this is* that the subscribing witnesses are supposed to know more about the making and executing of the contract or will, which they have been Called particularly to attest, and for that purpose to put their names to* than other persons whose attention and notice of the matter do not appear to have been so particularly required. Hence the party is not left at liberty ih the first instance to call whom he pleases to testify, but is compelled by the rule of law established in this behalf, to adduce first the subscribing witness or witnesses, if to be had. No such rule, however, applies to the case under consideration. I am therefore of opinion, that the court below was wrong in rejecting the evidence offered by the plaintiff in error.

On the second question, I also think that the court erred in charge ing the jury. The president judge who delivered the charge of the court to the jury, seems to have been most decidedly of opinion, and so instructed them, that without an agreement made between the father, the plaintiff in error, and his son Adam Jenner Ankrim, by Which the latter, in consideration and in satisfaction of the debt which he owed the former, assigned, transferred, or sold to him the debts owing to him, the son, for store goods sold and collected by the father, the debt which the son owed to the father could not be set oiFor defalcated out of the money so collected by the father. If the father* under an oral permission or authority from the son, and Without any transfer or assignment of these debts, collected them before the writ of domestic attachment was issued, he had most Unquestionably a right as against the son to have the amount of the debt which the son owed to him defalcated out of the moneys so collected. This he would clearly have been entitled to under the provisions of the defab cation act of 1705. The father, after Having collected the debts under such permission or authority, Would have stood indebted to the son in the amount of the money so collected, and the son being previously indebted to the father, they would then have been mutually indebted to each other in their own respective rights, thus bringing the case directly within the very letter as well as the spirit of the defalcation’act. If the son after this, and before the issuing of the writ of domestic attachment against him, had brought a suit against his father for the recovery of the money so’collected,, the father would have had a right to set off his debt owing to him by his *354son, against the son’s claim, so far as was necessary to satisfy it. Such being the right of the father against the son, upon this statement of the case, before the suing out of the writ of domestic attachment, I am at a loss to conceive how the suing out of that writ could divest the father of his vested rights, or place him in a worse situation with respect to his debt against bis son than he was before. The defendants in error, as trustees for the creditors of the son, by virtue of their appointment and the acts of assembly relative to domestic attachments, are only invested with those rights which existed in the son at and immediately before the suing out of the writ of domestic attachment against him; and have no power or authority beyond what he had at that time; unless where he before that assigned or conveyed away his estate, or anything belonging to him, for the purpose of defrauding his creditors, in which case the defendants in error, by the fifth section of the act of 1807, have full power given them to recover and dispose of whatsoever may have been so conveyed away, in (he same manner as if the son had been seized or possessed thereof himself at the time of suing out the writ of attachment. With this exception, it is manifest from the whole tenor of the acts of assembly on this subject, that the trustees have no right to claim what the son himself could not have claimed at the time of suing out the writ of domestic attachment. I am also further of opinion, that if the son, before the suing out of the writ of attachment against him, had brought an action of debt, or on the case, and declared in assumpsit for money had and received, against his father, the father might have set off the debt owing to him by the son, against the claim of the son, without giving any evidence to show that he had had even an authority from his son to collect the money; because the son, by bringing such action against the father, would have affirmed the authority of the father to collect and receive the money, and would thereby have acquitted those who had paid it to the father. And it seems to me likewise, that the trustees, by bringing this action against the father, have affirmed his authority to receive the money ; and if it was received by him before the suing out of the writ of domestic attachment, he would have a right to set off any debt owing to him anterior to that time by the son. If the defendants in error had not intended to affirm the authority of the father to receive the money, they ought to have looked to those persons respectively from whom the father received it.

From what I have already said on this second question in this case, it necessarily follows, that if there was an agreement made between the father and son, by which the son assigned the goods and debts to the father, to satisfy or secure to the father the debt which he owed to him ; or if the son gave up the goods and his books of account to the father for this purpose, and they were accepted by the father before the suing out of the writ of domestic attachment against the son, the father would be entitled to have his debt satisfied out of the money arising from the sale of the goods and the collection of the *355debts; and it would be wholly immaterial upon either of these hypotheses, whether the debts were collected before or since the issuing of the writ of attachment.

The judgment is reversed and a venire facias de novo awarded, if the defendants in error should think that they have any chance of success in their suit, upon the principles here laid down.

Judgment reversed, and a venire facias de novo awarded.