The Vestry in every Parish mentioned in either of the Schedules (A.) and (B.) to this Act shall consist of a certain Number of Persons qualified and elected as herein provided; (that is to say,) Eighteen Vestrymen for every Parish in which the Number of rated Householders shall not exceed One thousand; and Six additional Vestrymen, that is, Twenty-four Vestrymen for every parish in which the Number of rated Householders shall exceed One thousand; and Twelve additional Vestrymen, that is, Thirty-six Vestrymen, for every Parish in which the Number of rated Householders shall exceed Two thousand; and so on at the Proportion of Twelve additional Vestrymen for every Thousand rated Householders : Provided always, that in no Case the Number of Vestrymen shall exceed One hundred and twenty: Provided also, that the Incumbent and Churchwardens of each such Parish shall constitute n Part of the Vestry, and shall vote therein, in addition to the elected Vestrymen: Provided also, that every District Rector now constituting in any such Parish a Part of the Vestry thereof shall continue to constitute a Part of the Vestry thereof under this Act: Provided also, that where in any Parish the whole Number of Persons qualified to be Vestryman shall not amount to Eighteen, the Vestry thereof shall consist of so many Persons as are so qualified, anything in this Act to the contrary notwithstanding.