Edwards v. Canada (Attorney General) <1930> A.C. 124 – also known as the Persons Case – is a famous Canadian and British constitutional case where it was first decided that women were eligible to sit in the Canadian Senate. The case, put forward by a group of women known as the Famous Five, went all the way to the Imperial Privy Council, then the court of last resort for Canada, and was a landmark case in at least two respects. The persons case established that Canadian women were eligible to be appointed senators and more generally, that Canadian women had the same rights as Canadian men with respect to positions of political power. Second, it established what came to be known as the "living tree doctrine", which is a doctrine of constitutional interpretation that says that a constitution is organic and must be read in a broad and liberal manner so as to adapt it to changing times.
http://en.wikipedia.org/wiki/Persons_case