Haines, J.

The finding in this case shows that the New York, New Haven and Hartford Railroad Company, at the time of the trial, owned the stock of the defendant, The Connecticut Company, but had no control whatever over the management of the latter, that one of the jurors, Mr. Munn, was a pensioner and a former baggage-master of the railroad company; and that these facts regarding the juror were unknown to plaintiffs’ counsel.

The question raised by the appeal is whether Mr. Munn was thus disqualified for service on the jury panel in the trial of these cases against the Connecticut Company; and if these facts did disqualify him, the further question is presented whether that disqualification was waived by the plaintiffs by anything disclosed by the record.

Prior to the disposition of these questions, our attention is directed to an application made in this court to rectify the appeal on the ground that paragraph six of the finding should be stricken from the record. The paragraph, to which objection is made, reads as follows: “6. The attorney for the plaintiffs in the above entitled cases was aware of the character of the relationship between the defendant, The Connecticut Company, and the said railroad, and on previous trials of causes against The Connecticut Company had specifically questioned prospective jurors as to their relationship with the said railroad, as well as with The Connecticut Company.” In the trial court the plain *540 tiffs made a similar motion, basing it upon the claim that the paragraph in question was not supported by the evidence. The trial court filed a memorandum of decision denying the motion and giving reasons therefor. To the application in this court, the defendant entered a general denial, and written arguments were filed under the provisions of General Statutes, § 5836. Attached to the present application are the motion made in the trial court, the memorandum of decision, and the official stenographer’s transcript reciting the facts surrounding the examination of the prospective jurors and a statement of what transpired at the hearing on the motion.

The question is whether there are any statements of witnesses, or statements or admissions of counsel, or any proper matters of judicial notice which can be discovered in the record before us to justify these findings of fact. The evidence given by witnesses is brief and contains no hint that either plaintiffs or their counsel had any knowledge of the fact that the railroad company owned the stock of the defendant company. Nor do we find anything in the record which in any way shows that plaintiffs’ counsel “on previous' trials of causes against the Connecticut Company had specifically questioned prospective jurors as to their relationship with the said railroad as well as with the Connecticut Company.”

It is to be noted, moreover, that if this portion of the finding was justified by anything before the trial court, it was, after all, merely evidentiary in itself as tending to show that counsel knew of the relationship, and this latter is specifically stated as a fact in paragraph six of the finding, as follows:' “The attorney for the plaintiffs in the above entitled cases was aware of the character of the relationship between the *541 defendant, The Connecticut Company, and the said railroad.”

We find nothing in the record to support this conclusion save the suggestion contained in the court’s memorandum of decision: “. . . It is, however, a fact of common knowledge among the legal profession that some ownership of The Connecticut Company exists in behalf of the railroad, and upon argument of this motion, counsel for the defendant stated that plaintiffs’ counsel was aware of the character of this relationship. . . . This is not denied and the court must therefore assume it to be true.” This was obviously the source of the court’s conclusion.

We do not think these conditions can fairly be held to be of such “common knowledge” to the legal profession, or to the layman, that it could be specifically found that counsel for the plaintiffs, or the plaintiffs themselves, knew them. Nor do we think it follows that a declaration by defendant’s counsel that the plaintiffs’ attorney knew, must be assumed to be true because the latter made no denial. We do not think the facts upon the record, bring this within the rule permitting a conclusive inference. There are too many possible explanations of such a failure, to justify invoking the rule. The exact language in which, or the circumstances under which, the statement was made, is not of record, nor is it found that the statement was or should have been heard or understood by plaintiffs’ counsel. Upon the record as it stands, we feel the court was not justified in thus accepting the fact as established. Without a more detailed statement of the subordinate facts, the connection is too tenuous to justify action which might have a vital bearing upon the rights of the plaintiffs. The application to rectify the appeal by striking out paragraph six of the finding, is granted.

*542 As the record stands then, we come to the first four questions raised by the appeal, and we take up the first ground of error, that denying the motions of the plaintiffs to set aside the verdicts by reason of the claimed disqualification of the juror, Mr. Munn.

The disqualification of a juror may be based upon the statute or upon the rules of the common law. In this State, a juror is disqualified by statute who is not an elector, who is less than twenty-five years of age, or who is not esteemed in his community to be a man of good character, approved integrity, sound judgment and fair education; General Statutes, § 5681; or upon motion of either party a juror is disqualified, who has “served at a previous term, within a period of five years, on any jury in the court in which such action is pending.” Public Acts of 1925, Chap. 194.

At common law, a challenge to the polls, as distinguished from a challenge to the array, would lie for want of qualifications, as for alienage or infancy, or a prior conviction for certain infamous crimes, as well as for bias or prejudice. A challenge for this cause could be either a principal challenge or a challenge to the favor, as it was called. Of the former, were relationship to either party to the suit, a former service as arbitrator on either side, an interest in the outcome of the suit, either personal or as a member of a corporation, or the relation of master or servant, steward, attorney, landlord or tenant to either party, or that the prospective juror has conversed with either party upon the merits of the case, or has formed or expressed an opinion on the question at issue. Such facts being proved, the disqualification was conclusively presumed. It was a legal conclusion and it could not be rebutted.

Challenges for favor were founded on probable circumstances of suspicion, as for example, particular friendship, or enmity, or such other facts as would *543 tend to show bias but did not create a conclusive presumption of disqualification. In such cases, if the court had reason to think that bias or prejudice in fact existed to such an extent that the juror could not give the parties a fair trial, the juror would be held disqualified; but while this thus lay in the sound discretion of the court, it was said the court “ought not to indulge any unreasonable and groundless suspicion of a party.” These grounds of challenge are of the same nature as the principal challenge propter affectum, but of an inferior degree. Bacon, Abridgment, Juries, (E) 1; Chitty, Criminal Law, Yol. 1, p. 536; 1 Swift’s Digest, s.p. 737; State v. Howard, 17 N. H. 171, 191; Coughlin v. The People, 144 Ill. 140, 164, 33 N. E. 1.

The doctrine is pretty generally held that for those causes falling under the head of principal challenge, referring to the more strictly legal qualification, there could be no remedy after verdict rendered, but the disqualification was healed by the verdict; while for other causes, under the head of challenge for favor, where the disqualification was for the court’s determination as a fact, their proof after verdict entitled the complaining party to a new trial unless the defect or disqualification was known to him and waived by him during the trial. State v. Brockhaus, 72 Conn. 109, 112-115, 43 Atl. 850; Selleck v. Sugar Hollow Turnpike Co., 13 Conn. 453, 459; State v. Watkins, 9 Conn. 47, 51; Pettibone v. Phelps, 13 Conn. 445, 450-452; Wassum v. Feeney, 121 Mass. 93, 94.

In the case of Brewer v. Jacobs (Tenn.) 22 Fed. 217, at page 234, the court said: “Motions for a new trial in Tennessee, even in criminal cases, have been always regarded with disfavor by courts when the motions are grounded on such disqualifications of a juror as a challenge propter defectum upon the trial would *544 disclose. The want of these purely statutory qualifications, such as citizenship, age, property, . . . etc., which do not go to make up the really (not purely legal) necessary and essential qualities to enable the juror to do his duty intelligently and impartially in the case, have never in this State, or elsewhere, been treated with the same strictness as objections to the juror for bias, partiality, criminality, and the like causes reached by challenge propter affectum, and propter delictum as designated in the common law. Indeed, the courts are swift to lay hold of an argur ment or fact in the record on which to ground a denial of these motions when based upon the propter defectum class of juror disqualifications, especially where they can see that no injury has thereby resulted to the party objecting to the verdict.”

In the case before us, the trial court did not determine whether the fact that Mr. Munn was a pensioner of the railroad company which owned all the stock of the defendant company, did create a bias or prejudice which would disqualify him, but left the question open and decided the motion upon the claim of waiver.

Though the precise question thus presented has not arisen in this State, a very similar condition of facts was disclosed in the case of Quinebaug Bank v. Leavens, 20 Conn. 87. In that case, the juror was the father of one of the stockholders of the plaintiff bank, the prevailing party, and the defendant was not aware of that fact when the jury was impaneled. The opinion in that case does not specifically decide whether the relation did in fact create a disqualification, but proceeds to say that if it did, the disqualification was waived by the complaining party' for failure to inquire upon the voir dire or take any reasonable pains from which the relationship might have been ascertained, and that this inquiry should *545 have been made because from “the fact that a banking corporation was the plaintiff, consisting of numerous stockholders, they might well suspect, either that some stockholder, or one or more of their many relatives, might be found upon the jury.”

Probably for the reason that the decision was put on the ground of waiver, the opinion did not decide the claim made by the respondent in that case, that if it was a disqualification, it was a harmless one unless it was further shown that the juror knew his son was a stockholder.

In the case before us, a possible pecuniary interest on the part of the juror, in the result of the trial, is too remote to merit serious consideration. Manion v. Flynn, 39 Conn. 330, 332. The ground of disqualification, if any, was one of possible bias, and if it had a technical existence, was a harmless one unless it created an actual prejudice or bias in the mind of the juror.

As we have already said, we do not think such a private detail of the relationship between the two companies as the actual ownership of the stock, is a matter of such common knowledge that we can presume it was known to Mr. Munn himself. There is nothing in the record to indicate in any way that, in accepting service on this panel, he acted in bad faith. We rather construe his silence to indicate that he did not know about this matter. It seems too clear for serious discussion that if he was not aware that the stock was owned by the railroad company, he could not have been prejudiced or biased by the fact that it did own it.

If the record disclosed that he did know and yet remained silent, a very different situation would be presented. It not appearing that he had this knowledge of the ownership of the stock, a claim of bias *546 arising from the fact of such ownership, must fail. His judgment could not have been affected even insensibly by a circumstance of the existence of which he was not aware. Traviss v. Commonwealth, 106 Pa. St. 597, 607.

In Wood v. Holah, 80 Conn. 314, 316, 68 Atl. 323, we said: “The misconduct of a trier, whether judge or juror, where the prevailing party is. without fault, -does not ipso facto justify the grant of a new trial. There must appear to have been prejudice to the unsuccessful party, or at least the possibility of it, before a court will be justified in depriving the successful party of the results of the litigation which he has by fair methods obtained.” And in the earlier case of Pettibone v. Phelps, 13 Conn. 445, at page 450: “The rule extracted from the cases seems to be, that however improper such conduct may have been, yet if it does not appear that it was occasioned by the prevailing party, or anyone in his behalf; if it do not indicate any improper bias upon the juror’s mind, and the court cannot see, that it either had, or might have had, an effect unfavorable to the party moving for a new trial; the verdict ought not to be set aside.” And this general principle applies not only to conduct on the part of a juror, but to all causes of challenge of this character.

Even though there was a technical disqualification, it was a harmless one, as the record stands, and it cannot furnish ground for a new trial. This results if the disqualification be treated as a cause of challenge for favor; and if it could be treated as a cause of principal challenge, it would have been healed by the verdict. State v. Brockhaus, 72 Conn. 109, 116, 43 Atl. 850; State v. Congdon, 14 R. I. 458, 461; Senterfeit v. Shealey, 71 S. C. 259, 51 S. E. 142, 146; Larkin v. Baty, 111 Ala. 303, 18 So. 666, 667; Te- *547 garden v. Phillips, 14 Ind. App. 27, 42 N. E. 549; Brewer v. Jacobs (Tenn.) 22 Fed. 217, 243, 244.

Since this view of the case gives the same results as that reached by the trial court, and the judgment must be sustained, it is not necessary to consider further questions raised by the appeal, as these could not in any event alter this conclusion.

There is no error.

In this opinion the other judges concurred.