1. In matters within the jurisdiction of Québec, all powers, authorities and functions which, in respect of like matters, were vested in or exercisable by the Governors or Lieutenant-Governors of the several Provinces now forming part of the Dominion of Canada or any of the said Provinces, under commissions, instructions or otherwise, at or before the passing of the Union Act, are and shall be (so far as the Parliament of Québec has power thus to enact) vested in and exercisable by the Lieutenant-Governor or Administrator for the time being of Québec, in the name of Her Majesty or otherwise as the case may require; subject always to the royal prerogative as heretofore.