And whereas the enfranchising of vassals of subject superiors, by causing them to become immediate vassals of the crown, is a matter of publick benefit which ought to be encouraged; it shall and may be lawful for any person seised in, or possessed of a tailzied estate in Scotland, comprehending lands or superiorities of vassals, under or holding of him, to sell to such vassals, or any of them, the superiorities over their respective lands, at such prices as the parties shall agree for, and thereupon to resign such lands for new infeftment, to be granted to such buyer of his own superiority, which shall be good and valid; any law, charter, tailzie or other act or deed to the contrary notwithstanding.