46 These passages from the speeches of Lords Reid, Wilberforce and Pearson, which were not contradicted in any of the other speeches, make clear that incapacity is a potentially qualifying, not a disqualifying, characteristic; that the underlying consideration informing the plea is true consent; that the relevant difference required between the document and the belief is "radical", but that is the measure of the lack of consent not a mechanical requirement of a positive informed belief; and that the lack of negligence required to be displayed is to be judged according to the circumstances of the person in question.
47 The submissions of Perpetual in support of the proposition that incapacity in fact disqualified a party from the plea of non est factum stressed what was said to be the inconsistency of the pleas of non est factum and incapacity. Particular reliance was placed on Gibbons v Wright [1954] HCA 17; 91 CLR 423. It is necessary to analyse Gibbons v Wright and its relationship with Petelin v Cullen in order to understand and express the relationship between the two pleas and to assess the extent to which, if at all, a lack of understanding, through incapacity, can found a plea of non est factum and the extent to which, if it be the case, incapacity is a mutually exclusive plea to non est factum, such that incapacity may not found the latter plea.
48 The controversy in Gibbons v Wright arose from the affairs of two sisters (Ethel Rose Gibbons and Olinda Gibbons) and their brother (Gustav Gibbons) and his wife (Bessie Melba Gibbons). Gustav died on 4 April 1943. Before he died, he and his two sisters (Ethel and Olinda) were seised of an estate in fee simple as joint tenants in certain land in Hobart, some of which was old system title and some of which was Torrens title. By indenture dated 14 April 1943 (in effect a deed of gift) between Ethel and Olinda on the one part and Bessie on the other part, Ethel and Olinda covenanted to do all things necessary to vest in Bessie the same right, title and interest in the land as Gustav had. In the same year, on 3 July 1943 (according to the reasons for judgment), by indenture of that date, Ethel and Olinda, of the one part, and themselves and Bessie of the other part conveyed to themselves and Bessie as joint tenants in fee simple the old system land and by memorandum of transfer of the same date Ethel and Olinda transferred to themselves and Bessie as joint tenants in fee simple the Torrens title land.
49 On 11 October 1944, Ethel and Olinda by separate instruments mortgaged their interests as joint tenants in the old system land to Reginald Charles Wright. This (if a valid instrument) severed the joint tenancies under the old system land.
50 On 6 December 1945, Ethel and Olinda executed a document in respect of the Torrens title land which was registered as a memorandum of transfer. By the document, Ethel transferred to Olinda her one-third share in the land and Olinda transferred to Ethel her one-third share in the land.
51 Ethel died the following month at Hobart, on 20 January 1946 and Olinda died later in the year at Hobart, on 30 November 1946. Mr Wright was the executor of both their wills and estates.
52 In the litigation between Bessie Gibbons and Mr Wright, Bessie, as plaintiff, claimed a declaration that the document executed on 6 December 1945 was ineffective in its terms and operation to sever the joint tenancy. This was dealt with as a separate question between the parties before the resolution of the balance of the litigation. Bessie succeeded at first instance. An appeal was taken directly to the High Court (Latham CJ, Rich and Dixon JJ). The Court reversed the trial judge: see Wright v Gibbons [1949] HCA 3; 78 CLR 313. The document (if otherwise valid) was held to be effective to sever the joint tenancy in the Torrens title land.
53 Upon Bessie Gibbons' failure to win the separate issue, she proceeded with the balance of the suit that had been commenced on 23 April 1947 seeking declarations that she was the sole surviving joint tenant, that the mortgages executed in October 1944 and the document executed on 6 December 1945 were ineffective to sever the joint tenancy, and rectification of the register. The remaining foundation for the claims was contained in a paragraph of the statement of claim set out at 91 CLR 425:
"… Olinda Gibbons and Ethel Rose Gibbons, or, alternatively, one or other of them, were not or was not of sound mind and understanding, nor capable of understanding or entering into the said purported transaction."
54 The trial proceeded before the Chief Justice and a jury. The jury found the following in answer to questions left to it by the Chief Justice: First, that at the time of the deed of gift (14 April 1943) Ethel was capable of understanding the effect of the deed, Ethel and Olinda did not stand in a confidential relationship to Bessie and were not under her influence and, in executing the deed, both Ethel and Olinda had independent legal advice. Secondly, as to the time of the execution of the conveyance to create the joint tenancy (3 July 1943) the same findings were made. Thirdly, at the times of executing the mortgages (11 October 1944) and of executing the document by way of transfer (6 December 1945) neither Ethel nor Olinda was capable of understanding the nature and effect thereof. (See the findings of the jury set out at 91 CLR 428.)
55 The Chief Justice ordered and declared that each of the two indentures of mortgage (of 11 October 1944) and the transfer (of 6 December 1945) was a nullity and of no effect. The recorder of titles was ordered to rectify the register.
56 The Full Court set aside these orders, having given Bessie an opportunity to amend the statement of claim to allege knowledge on the part of Mr Wright as a party to the two indenture of mortgage of the unsoundness of mind attributed to Ethel and Olinda.
57 Bessie appealed. The High Court (Dixon CJ, Kitto and Taylor JJ) dismissed the appeal in a judgment of the Court.
58 The Court recognised (at 437) that the phrase "the effect of the deed", taken apart from context, was ambiguous and so their Honours examined the Chief Justice's summing up. The records of the trial were less than perfect, there being no official transcript and four (to a degree conflicting) notes made by the lawyers who had been present. A variety of expressions were attributed to the Chief Justice. The Court concluded (at 437) that the phrase "the effect of the deed" in the questions referred to "the broad operation of the deed, as distinguished from its precise terms."
59 The Court first emphasised (at 437-438) that the law has no fixed standard of sanity or capacity as requisite for all transactions. Rather, it requires in relation to each transaction that each party shall have "a degree of" soundness of mind as to be capable of understanding the general nature of what he is doing by his participation (437). In discussing the House of Lords decision in Ball v Mannin (1829) 1 Dow & Cl 380; 6 ER 568, the Court noted that their Lordships rejected the need, in order to avoid a deed, to prove idiocy in the sense of "a total absence and deprivation of the faculty of reason" (438). Rather, their Lordships approved a statement as to the requisite capacity that the person was "capable of understanding what he did by executing the deed when its general purport was explained to him" (438). By reference to Ball v Mannin and a number of other cases the Court said at 438:
"… the mental capacity required by the law in respect of any instrument is relative to the particular transaction which is being effected by means of the instrument, and may be described as the capacity to understand the nature of that transaction when it is explained.
…
Ordinarily the nature of the transaction means in this connection the broad operation, the 'general purport' of the instrument; but in some cases it may mean the effect of a wider transaction which the instrument is a means of carrying out: …"
60 Turning their attention to the understanding of Ethel and Olinda, the Court found it was necessary that they should have been capable of understanding, if it had been explained to them, that by executing the mortgages and transfer they would be altering the character of their interests in the properties as to survivorship. This was not the direction of the Chief Justice. Nevertheless, the Court was satisfied that the jury's findings were sufficient to encompass the effect as expressed by the Court. The Court was therefore satisfied that (see 439):
"… the sisters lacked that capacity to understand which was necessary for the complete validity of the instruments."
61 The Court then turned to the effect of such a conclusion. It was necessary, of course, for Bessie to succeed, for this factual finding to be sufficient to render the mortgages and transfers absolutely void. Mr Wright had not avoided them, indeed he had affirmed them.
62 The Court set to one side lunatics so found where control, custody and power of disposition had passed to the Crown (439-440).
63 The Court examined the history of the law in relation to the validity of acts done by someone, not a lunatic so found, but of unsound mind, from the early doctrine that no man could be heard to set up his own disability or insanity. This is usually referred to as the principle in Beverley's Case (1603) 4 Co Rep 123b; 76 ER 1118. Holdsworth, A History of English Law, 2nd ed (1937 Methuen & Co) Vol 8 at p 53 says that it is indeed doubtful as to whether this was ever the law. Certainly by the early 19th century it seems only to have been applied when the incapable person was perceived to have been acting unconscionably. By the mid-19th century, the rule had disappeared: Dexter v Hall 82 US (15 Wallace) 9 at 21 (1873) and see the "learned note" to Gore v Gibson (1845) 9 Jur 140 at 142 and Molton v Camroux (1848) 2 Ex 487; 154 ER 584 and the discussion of the Court at 440-441. The subsequently applied principle grew out of one exception to the rule against setting up one's own insanity, being the case where the other party to the contract was aware of the insanity. The exception to the rule came, the Court said (at 441), to found the principle that lunacy was not sufficient to have the contract treated as invalid without proof of knowledge of the lunacy by the other party or proof "of the greatest reason to believe" it, and that this was so, even in circumstances which had not previously been covered by the rule against setting up one's own insanity. By the late 19th century the principle was, the Court said (at 441), as stated by Lopes LJ in Imperial Loan Company Limited v Stone [1892] 1 QB 599 at 602-603:
"… A contract made by a person of unsound mind is not voidable at that person's option if the other party to the contract believed at the time he made the contract that the person with whom he was dealing was of sound mind. In order to avoid a fair contract on the ground of insanity, the mental incapacity of the one must be known to the other of the contracting parties. A defendant who seeks to avoid a contract on the gound of his insanity, must plead and prove, not merely his incapacity, but also the plaintiff's knowledge of that fact, and unless he proves these two things he cannot succeed"