And be it enacted, That for the Purposes of this Act only, and for such Time only as the same shall be used for the Purposes of this Act, it shall be lawful for any Two of the principal Officers of the Duchy of Cornwall, under the Authority of a Warrant issued for that Purpose under the Hands of any Three or more of the Special Commissioners for the Time being for managing the Affairs of the Duchy of Cornwall, or under the Hands of any Three or more of the Persons who may hereafter for the Time being have the immediate Management of the said Duchy, if the said Duchy shall be then vested in the Crown, or if the said Duchy shall then be vested in a Duke of Cornwall, then under the Hand of the Chancellor for the Time being of the said Duchy, or under the Hands of any Three or more of the Persons for the Time being having the immediate Management of the said Duchy, by Deed under their Hands, to grant and convey to the Trustees or Trustee for the Time being of any existing School, or of any School intended to be established by virtue of this Act, any Lands, Tenements, or Hereditaments forming Part of the Possessions of the said Duchy of Cornwall, not exceeding in the whole One Acre in any One Parish, upon such Terms and Conditions as to the said Special Commissioners or Chancellor, or such other Persons as aforesaid, shall seem meet: Provided always, that upon the said Land so granted as aforesaid, or any Part thereof, ceasing to be used for the Purposes in this Act mentioned, the same shall thereupon immediately revert to and become again a Portion of the Possessions of the said Duchy, as fully to all Intents and Purposes as if this Act or any such Grant as aforesaid hath not been passed or made; any thing herein contained to the contrary notwithstanding.