Tt comes to this, then: Where there is a jury, it is the jury, and
the jury alone, that have the jurisdiction to determine the issues
of fact upon the evidence. The Court has so far control that
it must see that the jury do their duty properly. Beyond that the
Court cannot go. And if the jury have, in the opinion of the Court,
found a verdict which reasonable men might have found upon the
evidence before them, the Court is not at liberty to look further
and set that verdict aside as being against the weight of evidence.
If the finding is unreasonable, in the sense that the jury could not
have really performed the judicial duty cast upon them, but must
have been guided or moved by considerations other than the value
and weight to be given to the evidence - considerations that ought
not to have been entertained, and which vitiate the finding, because,
as Lord Herschell phrases it in Jones v. Spencer (2), it cannot be
said "' the jury have found their verdict upon the evidence," - then
there is, as that learned Lord and also Lord Shand there both say,
"a miscarriage," and the finding is, in the requisite sense, "' against
the weight of evidence," and the verdict may be set aside. The
preponderance of the evidence itself may, as Lord Selborne points
out, be such as to establish this absolute unreasonableness - a term
for which (as Lord Coleridge, in Dublin, Wicklow, and Wexford
Railway Co. v. Slattery (3), pointed out) there is no definite
standard; but, except for the purpose of ascertaining whether
that test is established, which every Court must determine for itself,
the Court has nothing to do with the weight of the evidence - that is
for the jury.