If any lands, not being situate in a town or built upon, shall be so cut through and divided by the works as to leave, either on both sides or on one side thereof, a less quantity of land than half a statute acre, and if the owner of such small parcel of land require the promoters of the undertaking to purchase the same along with the other land required for the purposes of the special Act, the promoters of the undertaking shall purchase the same accordingly, unless the owner thereof have other land adjoining to that so left into which the same can be thrown; and if such owner have any other land so adjoining, the promoters of the undertaking shall, if so required by the owner, at their own expence, throw the piece of land so left into such adjoining land, by removing the fences and levelling the sites thereof, and by soiling the same in a sufficient and workmanlike manner.