Seven acres of land on North Island, in Georgetown County, abutting and bounding to the eastward on the sea, to the west and north by lands belonging to Paul Trapier and to the south by Winyah Bay, has been ceded to the United States but on condition that nothing contained in this cession shall be construed to exclude or prevent any process, criminal or civil, issuing from any of the courts of this State from being served or executed within the limits of said tract of seven acres of land.