Except as provided by the third section of this Act, it shall not be competent for the Parliament of Canada to alter the provisions of the last-mentioned Act of the said Parliament in so far as it relates to the Province of Manitoba, or of any other Act hereafter establishing new Provinces in the said Dominion, subject always to the right of the Legislature of the Province of Manitoba to alter from time to time the provisions of any law respecting the qualification of electors and members of the Legislative Assembly and to make laws respecting elections in the said Province.