For the proposition that the rule of construction is inapplicable to a certificate of title the appellants claim support both in the language of the Real Property Ordinance and in the nature and purpose of the Torrens system of registration which the Ordinance embodies. So far as the terms of the Ordinance are concerned, it is true that in not a few places, and s. 52 is one of them, a foothold may be found for an argument that only specific descriptions of land are contemplated. Nevertheless, it is not impossible to reconcile the language of the Ordinance with the existence of the rule. Indeed, in New South Wales, where an amending section (45A) has been enacted (by s. 39 of the Act No. 44 of 1930) providing that the rule applies and shall be deemed always to have applied to instruments registered under the provisions of the Real Property Act, it has not been found necessary to make consequential alterations in the terms of the Act generally. Judicial decisions upon the point favour the application of the rule: Williams v. Booth [1] ; In re Priddle [2] ; In re White [3] . It is true, as the respondents have urged upon us, that if the rule applies to a certificate of title uncertainty may arise from the fact that since the presumption is rebuttable the question whether a certificate describing land as bounded by a river comprises also a half of the river bed is one which may depend upon circumstances extraneous to the instrument and incapable of being ascertained by search of the register. But this can hardly be regarded as important when one considers the case of a Crown grant of similarly described land. The Privy Council's decision that the rule applies to Crown grants in the colony preceded the passing of the first Real Property Act, the Act 26 Vict. No. 9 N.S.W., yet the fact that it applied to them did not deter the legislature from enacting that all land granted by the Crown on or after 1st January 1863 should be subject to the provisions of the Act, and giving Crown grants the same effect, when registered, as certificates of title: see ss. 12, 34 and 40 of the Act 26 Vict. No. 9 N.S.W., ss. 13, 35 and 42 of the Act No. 25 of 1900 N.S.W., and ss. 17, 47 and 58 of the Ordinance. Obviously there was no intention to displace Lord's Case [4] in respect of future Crown grants, and it is difficult to suppose that the Act intended, while accepting the resulting uncertainty so far as Crown grants were concerned, to reject it as regards certificates of title.