vendee buying better title

if a vendee buys up a better title than that of the vendor, and the vendor was guilty of no fraud, he can only be compelled to refund to the vendee the amount of money paid for the better title... Equity treats the purchaser as a trustee for his vendor, because he holds under him; and acts done to perfect the title by the former, when in possession of the land, inure to the benefit of him under whom the possession was obtained, and through whom a knowledge of a defect of title was obtained. The vendor and vendee stand in the relation of landlord and tenant; the vendee cannot disavow the vendor's title.