It shall be lawful for the Valuer, in pursuance of Instructions duly given in that Behalf, to sell any Rentcharge payable out of Allotments for the Labouring Poor for the Purpose of raising all or any Part of the Expenses of the Inclosure ; and such Rentcharge shall be sold and conveyed in such and the same Manner as if the same were Land sold under the said firstly-recited Act for Payment of the Expenses incident to an Inclosure.