64 Pa. Stat. § 4
All and every the private estates, lands and hereditaments of any of the said proprietaries, whereof they are now possessed, or to which they are now entitled, in their private several right or capacity, by devise, purchase or descent, and likewise all the lands, called and known by the name of the proprietary tenths or manors, which were duly surveyed and returned into the land office on or before the 4th day of July, in the year of our Lord 1776, together with the quit or other rents and arrearages of rents reserved out of the said proprietary tenths or manors, or any part or parts thereof, which have been sold, be confirmed, ratified and established forever, according to such estate or estates therein, and under such limitations, uses and trusts, as in and by the several and respective reservations, grants and conveyances thereof, are directed and appointed.
64 P.S. § 4