Sholl K.C. (with him Burbury), for the respondent Bessie Melba Gibbons. The onus of showing severance is on the appellants (Re Denny 1; Flynn v. Flynn 2 ). The nature of joint tenancy is explained in Australian Law Journal, vol. 9, p. 431; Holdsworth's History of English Law, vol. 3, pp. 126-128; Preston on Estates, 2nd ed. (1820), vol. 1, pp. 136-139; Blackstone's Commentaries, 19th ed. (1836), vol. 2, pp. 183, 191; 14th ed. (1803), vol. 2, p. 181 Carr on Collective Ownership, (1907) Chap. IV, esp. p. 33 Challis, Law of Real Property, 3rd ed. (1911) p. 367). Thus, until alienation, it is incorrect to talk about "A," "B" or "C" having any share at all. There is unity of interest, and all have the same thing. If "A" alienates a "share" to a stranger, it is only then that it becomes a "share." The right of alienation by a joint tenant is referred to in Preston on Estates, 2nd ed. (1820), vol. 1, pp. 136-139 Partriche v. Powlet 3; Blackstone's Commentaries, 19th ed. (1836), vol. 2, note II.; Hood &Challis, Property, Settled Land, Trustee and Administration Acts, 8th ed. (1938), pp. 105, 106. Alienation by a joint tenant to a stranger, or release of one joint tenant's share to another (i.e. operating as an extinguishment) constitutes a severance because the alienee comes in by a different title and the unity of title is destroyed. The Real Property Act recognizes joint tenancies. Severance is achieved (Williams v. Hensman 4; Flynn v. Flynn 5; Cruise's Digest, 3rd ed. (1824), vol. 2, pp. 447- 462) (a) by alienation which must destroy one of the four unities (apart from time) (Cruise's Digest, 3rd ed. (1824), vol. 2, p. 447, par. 1 Cheshire, Modern Law of Real Property, 5th ed. (1944), pp. 555-558); (b) by grant or transfer (Halsbury's Laws of England, 2nd ed., vol. 27, pp. 662, 663 Blackstone's Commentaries, 14th ed. (1803), vol. 2, p. 185; Watkins, Principles of Conveyancing, 8th ed. (1833), p. 99 Jenks, Modern Land Law, (1899), p. 171; Cruise's Digest, 3rd ed. (1824), vol. 2, p. 449, par. 10); (c) by release to the other, or another, joint tenant (Eustace v. Scawen 6; Chester V. Wilson 7; Chester v. Willan 8 Carr, Collective Ownership, (1907) p. 45; Co. Litt., 18th ed. (1823), vol. 2, p. 193a, S. 304, note (1): and see explanation in Co. Litt., 18th ed. (1823), vol. 2, p. 273 (b) Butterworth's Encyclopaedia of Forms and Precedents, 1st ed. (1907), vol. 12, p. 499 Evatt and Beckenham, Conveyancing Precedents and Forms, 2nd ed. (1938), p. 159; Goodeve and Potter,
1(1947) 116 L.J. Ch. 1029, at p.
2(1930) I.R. 337, at p. 343.
3(1740) 2 Atk. 54 [26 E.R. 430].
4(1861) 1 J. &H. 546 [70 E.R.
5(1930) I.R. 337, at p. 343.
6(1624) Cro. Jac. 696 [79 E.R.
7(1670) I Vent. 78 [86 E.R. 55].
8(1670) 2 Wms. Saund. 96a [85