And whereas it may frequently happen, that the inclosing of lands in Scotland may be retarded or prevented, or at least rendered inconvenient, by heirs of entail not having it in their power to exchange small parcels of the lands of their entailed estates for other lands convenient for the entailed estate; and more conducive to the improvement of the country in general: For remedy whereof, it shall and may be lawful for proprietors of entailed estates to excamb or make exchanges of land, with all and every person or persons, for the conveniency and advantage of the said estates, and for the improvement of the country where such estates are situated, by inclosing or otherways.