This Act shall extend only to such harbours, docks, or piers as shall be authorized by any Act of Parliament hereafter to be passed which shall declare that this Act shall be incorporated therewith; and all the clauses of this Act, save so far as they shall be expressly varied or excepted by any such Act shall apply to the undertaking authorized thereby, so far as they are applicable to such undertaking, and shall, with the clauses of every other Act incorporated therewith, form part of such Act, and be construed therewith as forming one Act.