13 Heir of entail laying out 4 years free rent, subsequent heir not to lay out more.
Provided also, that when a sum equal to four years free rent shall have been laid out, in manner above-mentioned, by one or more heir or heirs of entail, and shall remain a subsisting charge against the succeeding heirs; it shall not be lawful for any subsequent heir or heirs to lay out any more money under the authority of this Act, for any of the improvements afore-mentioned.