It shall be lawful for the Queen, by and with the Advice of Her Majesty's Most Honourable Privy Council, to declare by Proclamation that, on and after a Day therein appointed, not being more than Six Months after the passing of this Act, the Provinces of Canada, Nova Scotia, and New Brunswick shall form and be One Dominion under the Name of Canada ; and on and after that Day those Three Provinces shall form and be One Dominion under that Name accordingly.