All powers or duties to be performed by the vestry of any parish adopting this Act may be exercised and performed respectively by the major part of such vestry assembled at any meeting, there not being less than five vestrymen present at a meeting of a vestry which consists of twelve or more elected vestrymen and not exceeding twenty-three, and not being less than seven vestrymen present at a meeting of a vestry which consists of twenty-four or more elected vestrymen and not exceeding thirty-five, and not being less than nine vestrymen present at a meeting of a vestry which consists of thirty-six elected vestrymen or upwards; and all orders and directions given, and all contracts and engagements entered into, by the vestrymen present at any such meeting, or the major part of them than assembled, shall be as valid and effectual as if the same were done by all the said vestrymen for the time being, and shall be binding and conclusive on all such vestrymen, provided that the same is confirmed at the next subsequent meeting of the vestry.