to be a private deliberation, the constant subject of public investigation — to the destruction of all frankness and freedom of discussion and conference.
The rule on the subject has varied. Prior to 1785 a juror’s testimony in such cases was sometimes received though always with great caution. In that year Lord Mansfield, in Vaise v. Delaval, 1 T. R. 11 refused to receive the affidavit of jurors to prove that their verdict had been made by lot. That ruling soon came to be almost universally followed in England and in this country. Subsequently, by statute in some States, and by decisions in a few others, the juror’s affidavit as to an overt act of misconduct, which was capable of being controverted by other jurors, was made admissible. And, of course, the argument in favor of receiving such evidence is not only very strong but unanswerable — when looked at solely from the standpoint of the private party who has been wronged by such misconduct. The argument, however, has not been sufficiently convincing to induce legislatures generally to repeal or to modify the rule. For, while it may often exclude the only possible evidence of misconduct, a change in the rule “would open thé door to the most pernicious arts and tampering with jurors.” “The practice would be replete with dangerous consequences.” “It would lead to the grossest fraud and abuse” and “no verdict would be safe.” Cluggage v. Swan, 4 Binn. 155; Straker v. Graham, 4 M. & W. 721.
There are only three instances in which the subject has been before this court. In United States v. Reid, 12 How. 361, 366, the question, though raised, was not decided because not necessary for the determination of the case. In Clyde Mattox v. United States, 146 U. S. 140, 148, such evidence was received to show that newspaper comments on a pending capital case had been read by the jurors. Both of those decisions recognize that it would not be safe to lay down any inflexible rule because there