..., unless admitted, are not evidence and cannot be relied on in negativing the case of a party to whom the suggestions were made during his cross-examination. In the circumstances, in our view, the...position in law, it would be wrong not to permit the tenant to contend and show, if possible, on plaintiff's evidence and materials as are on record, both at the trial and also at the appeal stage, that the...plaintiff is not entitled to the decree prayed for, though he would not be permitted either to cross examine plaintiff's witnesses, when they give evidence, or to call his own witnesses at the trial...