All sales of lands, tenements and hereditaments, formerly made by any attorneys or agents, who have been appointed such by any person or persons who had right so to do, and especially give them power or directions therein to sell or convey lands, are and shall be deemed and adjudged good and effectual in law, to all intents, constructions and purposes, whatsoever, as fully as if the said owners of such lands had, by their own deeds, bargains and sales, actually and really sold and conveyed the same; and all and singular the lands, tenements and hereditaments, sold and conveyed as aforesaid, shall be and remain to such purchasers respectively, their heirs and assigns, forever, as they were or ought to have been to the owner or owners of such lands and premises so employing his or their attorneys or agents as aforesaid.