What are the reasons of a judge's finding that the evidence is inadequate?

'Manifestly it would be unreasonable to infer a statutory intent that the court's stated reasons embrace a discussion of the weight to be given, and the inferences to be drawn from each item of evidence supporting, or impeaching, the judgment. This, we believe, is why the court in Mercer v. Perez, supra, * * * stated 'we hold that if the ground relied upon is 'insufficiency of the evidence' the judge must Briefly recite the respects in which he finds the evidence to be legally inadequate.' * * *