Before parting with this aspect of the matter, we might mention that in Slaughter v. Storm and Storm Press Pty. Ltd. [3] , Mansfield C.J. considered himself as following both Helton v. Allen [2] and Narayanan Chettyar v. Official Assignee of the High Court, Rangoon [4] when he said that the plaintiff must prove allegations of fraud "as clearly as they would have to be proved in a criminal proceeding", these being Lord Atkin's words in New York v. Heirs of Phillips Dec'd [5] . If this phrase is used to mean no more than that proof of fraud should be clear and cogent such as to induce, on a balance of probabilities, an actual persuasion of the mind as to the existence of the fraud, it is in accordance with the decision of this Court in Helton v. Allen [2] , but it is, in our opinion, at variance with the proposition in the sentence in Privy Council's judgment in Narayanan's Case [4] . The "clarity" of the proof required, where so serious a matter as fraud is to be found, is an acknowledgment that the degree of satisfaction for which the civil standard of proof calls may vary according to the gravity of the fact to be proved: see Briginshaw v. Briginshaw [6] , per Dixon J. [7] ; Helton v. Allen [2] per Starke J. [8] ; Smith Bros. v. Madden [9] , per Dixon J. [10] .