In Wong v Lee, a 1993 British Columbia Court of Appeal case, cited at 49 ETR 121, and quoting from Theobald on Wills:
"The principle of falsa demonstratio non nocet means that if, on considering the language of a will with the aid of any admissible extrinsic evidence, the court comes to the conclusion that the testator intended to pass something and can determine what that something is, then the fact that the testator gave it a wrong description in his will does not prevent the will taking effect in regard to the subject matter intended by the testator. The principle may be applied in whatever part of the description the error occurred ...
"Thus, if T makes a specific gift of certain stock, and T at the date of his will possessed no such stock but possessed other stock which the court decides was meant, the latter stock passes under the gift despite the false description."