32 Pa. Stat. § 511
From and after the passage of this act if any person or persons shall take up any logs, shingles, shingle-bolts, boards or lumber of any kind, or any flat-boat floating upon the waters of the Ohio, Allegheny or Monongahela rivers, or of any of their tributaries, or lying upon the shores of the same, it shall be the duty of such person or persons so taking up such logs, lumber or flat-boat, within five days after taking up the same, to make out a list and description of such logs, lumber or flat-boat, with the marks, letters or names thereon, and to post up such list and description in at least three conspicuous places in the town, township, ward or borough in which such logs, lumber or flat-boat were taken up; and if the owner or owners of any such logs, lumber or flat-boat, his or their agent or agents, shall not call for and take away the same within three months after the giving of the notice aforesaid, such logs, lumber or flat-boat, shall become forfeited to the person or persons so taking up the same.
32 P.S. § 511