Instead of appointing one archdeacon to either of the new canonries respectively founded in the cathedral churches of Saint Paul in London and of Lincoln, or of annexing a canonry in any cathedral or collegiate church to an archdeaconry as aforesaid charged with any payment to another archdeacon in the same diocese, the rights, duties, and emoluments of any canonry, the average annual income of which may exceed eight hundred pounds, may, by the authority herein-after provided, be annexed to two archdeaconries jointly within the same diocese, not otherwise competently endowed, each archdeacon taking his turn of residence for such time, and taking such share of the emoluments, as shall be directed by the scheme and order authorizing such annexation: and each archdeacon shall during his turn of residence have all the rights and privileges of a canon (except as to the division of the emoluments); and every future archdeacon whose archdeaconry shall be endowed as last aforesaid shall be deemed the holder of cathedral preferment within the meaning of the last recited Act.