delivered the opinion of the court.
Th.e appellee, Hattie Taylor, on February 37, 1883, made a motion in the Kenton County Court to probate four letters from John B. Fee to her, dated respectively January 4, 1880, July 8, 1880, January 3, .1881, and June 30, 1881, as his last will. The appel*261lees, Ms two 'sisters, objected, claiming that so much of the first and two last above-named letters as was1, of a testamentary character had been forged; and. that the other letter, dated July 8, I860, was a forgery in toto.
Upon hearing, the county court probated the last-named one and that of January 4, 1880; and from, this judgment the appellants appealed to the circuit-court, and then applied for a change of venue, which was properly refused. The appellee then filed a statement to the effect that she offered for probate only the letter of July 8, 1880, and would not offer that dated January 4, 1880; but was willing the court 'should reject the latter or direct the jury to find that it was not the last will of the decedent. The parties, then went to trial, resulting in a finding that the letter of July 8, 1880, was such last will; and we are now asked to review the case upon an assignment, of only one hundred and three errors. We shall only-notice such as are deemed material. It is urged that, the peremptory instruction to find for the appellants, should have been given, because no testimony whatever was offered to show soundness of mind of the.writer when the letter of July 8, 1880, was written. When, however, the due execution of a paper, rational in its provisions, and consistent in its details, language and structure, has been proven, the propounder has made out a prima facie case; and the-burden of showing that the testator was not of - a-sound and disposing mind when the writing was executed shifts to the contestant. The third instruction given by the court conformed to this rule. The ap*262pellants offered to show, by experts, by what is commonly known as a comparison of hands, and who did not know the handwriting of the deceased, that the paper in contest was not genuine.
The letter written by the deceased on July 3, • 1880, and which was proven and admitted to be genuine, had been properly allowed to go to the jury as evidence, as it was referred to in the one of July 8th; :and they proposed to so show, not only by a comparison between it and the disputed one, but between the latter and the other three letters that had been •offered for probate in the county court.
Witnesses were at hand and had already testified, who knew .the handwriting of the deceased. Any necessity, therefore, for such a course, even if it were allowable, did not exist.
The general rule is, that a witness who is introduced to prove the handwriting of a person, must have personal knowledge of it, either by having seen him write, or by having' seen writing admitted by him to be his or, with his knowledge, acted upon as his, or ¡so adopted into the ordinary business of life as to ■create a reasonable presumption of its genuineness. The exceptions to this rule as given by Mr. Grreenleaf, in the first volume of his work upon evidence, section 577, are, first, where the paper is not old enough to prove itself, and yet is so old that living witnesses ■can not be had; then other writings, proven to be .genuine, or to have been treated and acted upon as ¡such by all parties, may be offered, and experts may, ‘by comparison, give their opinion as to the genuineness of the writing in question; or second, where *263■other writings admitted to be genuine are already in the case; and then the jury may make the comparison with or without the expert aid.
The civil and ecclesiastical law permitted the testimony of experts as to handwriting by comparison. 'The rule in this country varies in the different States. In some of them the comparison is allowable between the writing in question and any other writing shown do be genuine, whether it be already in the case or not, or relevant or not; while in others it is only permitted as between the disputed paper and one already in thé case and relevant to it. Under the rule as .adopted in this State, however, the last exception supra, and which allows comparison by the jury with ■or without the aid of experts, is not recognized, the reason doubtless being that no necessity exists for it when witnesses are at hand who know the handwriting. (Hawkins v. Grimes, 13 B. M., 257.)
In view of the necessarily uncertain character of such expert testimony, and the fact that as the media ■of evidence are multiplied the chances of mistake are increased, we regard this as the correct rule; but we must not be understood as holding that an expert may not testify as to differences in the letters or words, or speak of other facts as they appear to him rupon the face of a writing.
The court below, however, refused to permit the •appellants to offer in evidence the other three letters . which had been offered in the county court by the •appellee as being, together with the letter of July 8, 1880, the will of the decedent, or to show that she had r:so offered them, and had herself testified that they *264were-wholly in the handwriting of the decedent; and. to then show (as they claimed they could) that he had not written the testamentary parts thereof.
It is true that these papers were not then in issue. Even one of the two that had been probated in the .county court’ was not, because the appellee had, as she had a right to do, elected not to rely upon it.. But by so doing she could not deprive the appellants of the right to use them as testimony if they were-competent and they so desired. Evidence, • to be admissible, must be pertinent .to the issue. If it relates; to the transaction under consideration, or is connected with it and is not too remote, it is competent. Mr. Wharton says that “it is relevant to .put in evidence-any circumstance which tends to make the proposition at issue either more or less improbable.” (1 Wharton on Evidence, section 21.)
This is unlike the case of a suit upon several notes-where the defense is forgery, and the plaintiff dismisses as to three of them. In this instance, all four of the letters were- offered by the appellee in the county court as the will of the decedent, with, her avowal and testimony by her that they were-genuine. This was her act or conduct, and there was, in our opinion, such a connection between them and the transaction or question at issue in the circuit court as rendered the testimony competent.
For illustration merely,- suppose that A offers a letter as the will of B, and it is contested by 0 as; a forgery, would not the latter have the right to-offer in evidence letters to the same purport that' might be found in A’s possession, which were efforts. *265at imitation; and this, too, although A had not offered any of them as the will or as a part of it.
We do not mean to intimate what might have-been the effect of the testimony in question, or-whether, in our opinion, it would have been true or false, or whether it would or would not have produced a different result. The issue was of such a character that it would be improper for us to attempt to measure its effect. It follows that the-testimony of the witness Yan Loo, and the photographic copies -of the letters, were competent evidence for the appellants, provided the court was. first satisfied of their accuracy.
As the case, for the errors above indicated, must go back for another trial, it is proper for us to say that, in our opinion, the letters offered by the appellee, which were shown to have been written by her to the decedent, and to have been in his possession at his death, were competent evidence. They were a part of one correspondence of which the other-part was already in evidence, and were of such a. connected character that the whole correspondence-was necessary to properly enlighten the jury.
Judgment reversed, and cause remanded for further proceedings in conformity to this opinion.-