If a trial has been regularly conducted and the party against whom the verdict has passed cannot complain that evidence has been wrongly received or rejected or that there has been a misdirection or that he has not been fully heard or has been taken by surprise or that the result is not warranted by the evidence, the successful party is not to be deprived of the verdict he has obtained except to fulfil an imperative demand of justice. The discovery of fresh evidence makes no such demand upon justice unless it is almost certain that, if the evidence had been available and had been adduced, an opposite result would have been reached and unless no reasonable diligence upon the part of the defeated party would have enabled him to procure the evidence. In Scott v. Scott [1] the Judge Ordinary (Lord Penzance) observes upon the enormous evil that new trials are in themselves, though justice sometimes demands them: "No element in the administration of justice is so destructive of its efficiency as uncertainty; and no grievance more sorely felt by suitors than that which snatches success away at the moment of its accomplishment, and sets all abroad and in doubt again after one complete hearing and decision. Nothing shakes so much that confidence in the law which it is the first duty of all tribunals to uphold." Afterwards his Lordship speaks of the practice at common law with reference to new trials because of the discovery of fresh evidence. "It has never been the habit in Westminister Hall to grant new trials on the simple ground that the party could make the same case stronger by corroborating testimony (even though newly discovered) if another trial were allowed. And if it were otherwise, there are few cases that would not be tried a second time." The rule stated in Chitty's Practice was that if new evidence discovered after the trial is such as to satisfy the court that if the party had had it at the trial he must have had a verdict, the court will grant a new trial on the payment of costs in order to do justice between the parties. Variations of phraseology occur in later cases but however it is expressed the sense of the rule remains that the new evidence must have so high a probative value with reference to an issue essential to the cause of action or defence as the case may be that it cannot reasonably be supposed that had the evidence been adduced the issue would not have been found for the party seeking the new trial. In Brown v. Dean [1] , Lord Loreburn L.C. says: "When a litigant has obtained a judgment in a court of justice he is by law entitled not to be deprived of that judgment without very solid grounds; and where (as in this case) the ground is the alleged discovery of new evidence, it must at least be such as is presumably to be believed, and if believed, would be conclusive." Lord Shaw [2] says that he cannot go the whole length of the proposition that it must be conclusive. "It is possible to figure cases in which it might be so gravely material and so clearly relevant as to entitle the court to say that that material and relevant fact should have been before the jury in giving its decision." In Hip Foong Hong v. Neotia & Co. [3] , Lord Buckmaster, speaking for the Judicial Committee, says: "In all applications for a new trial the fundamental ground must be that there has been a miscarriage of justice. If no charge of fraud or surprise is brought forward, it is not sufficient to show that there was further evidence that could have been adduced to support the claim of the losing parties; the applicant must go further and show that the evidence was of such a character that it would, so far as can be foreseen, have formed a determining factor in the result." The language of Collins L.J. in Young v. Kershaw [1] is "practically conclusive - that is, evidence of such a class as to render it probable almost beyond doubt that the verdict would be different." That of Williams J. in Kennedy v. Jones [2] is that "it ought to be clearly established that the effect of the suggested evidence would be not only to render it possible that a different conclusion might be arrived at, but that it would be the duty of the jury to come to a different conclusion." The test proposed by Scrutton L.J. in Guest v. Ibbotson [3] is that the evidence is so material that its absence will cause or has caused a miscarriage of justice. In R. v. Copestake; Ex parte Wilkinson [4] his Lordship said that the Court of Appeal had clearly decided that the evidence must be of such weight, as if believed, would probably have an important influence on the result but had not gone so far as the full extent of Lord Loreburn's statement. This language was adopted by the Supreme Court of New South Wales in Meredith v. Innes [5] . In Preston v. Green [6] , Jordan C.J. no doubt has this in mind when, in framing the questions to be considered in determining whether a new trial should be directed, he expresses the two that are material to the strength of the evidence thus - (1) Is the new evidence prima facie likely to be believed? (2) If believed, would it be likely to be a determining or at least a very important factor in the result of the trial? In Queensland a like test has been framed: Boyd v. Boyd [7] ; Stiffler v. Stiffler [8] .