mind that it has not the advantage which the trial Judge had in having the witnesses before him and of observing the manner in which they deposed in court. This certainly does not mean that when an appeal lies on facts, the appellate court is not competent to reverse a finding of fact arrived at by the trial Judge. The rule is— and it is nothing more than a rule of practice—that when there is conflict of oral evidence of the parties on any matter in issue and the decision hinges upon the credibility of the witnesses, then unless there is some special feature about the evidence of a particular witness which has escaped the trial Judge's notice or there is a sufficient balance of improbability to displace his opinion as to where the credibility lies, the appellate court should not interfere with the finding of the trial Judge on a question of fact.20 51. The area in which the question lies in the present case is the area of the perceptive functions of the trial Judge where the