That if any Tenant of a Farm or Lands shall, after the passing of this Act, with the Consent in Writing of the Landlord for the Time being, at his own Cost and Expense, erect any Farm-building, either detached or otherwise, or put up any other Building, Engine, or Machinery, either for Agricultural Purposes or for the Purposes of Trade and Agriculture, (which shall not have been erected or put up in pursuance of some Obligation in that Behalf,) then all such Buildings, Engines, and Machinery shall be the Property of the Tenant, and shall be removable by him, notwithstanding the same may consist of separate Buildings, or that the same or any Part thereof may be built in or permanently fixed to the Soil, so as the Tenant making any such Removal do not in anywise injure the Land or Buildings belonging to the Landlord, or otherwise do put the same in like Plight and Condition, or as good Plight and Condition, as the same were in before the Erection of anything so removed: Provided nevertheless, that no Tenant shall, under the Provision last aforesaid, be entitled to remove any such Matter or Thing as aforesaid without first giving to the Landlord or his Agent One Month's previous Notice in Writing of his Intention so to do; and thereupon it shall be lawful for the Landlord, or his Agent on his Authority, to elect to purchase the Matters and Things so proposed to be removed, or any of them, and the Right to remove the same shall thereby cease, and the same . shall belong to the Landlord; and the Value thereof shall be ascertained and determined by Two Referees, One to be chosen by each Party, or by an Umpire to be named by such Referees, and shall be paid or allowed in account by the Landlord who shall have so elected to purchase the same.