64 Pa. Stat. § 33
All purchase money due for lands in this state taken up, or entries thereof made, by any grant, license, warrant, application, or office right whatever, before the said tenth day of December, in the year aforesaid, shall be paid in to the receiver general of the Land-Office hereby established, that is to say; the one-fourth part thereof in one year after the passing this act, one other fourth part thereof in two years after passing this act, and one other fourth part thereof in three years after passing this act, and the residue thereof in four years after the passing this act. And in case of neglect or refusal of paying the aforesaid quotas of the purchase money, and interest, at the time herein limited for the payment thereof, by the space of six months, it shall and may be lawful for the Commissioners of the county where the lands lie to issue their warrant to the Sheriff of the said county, who is hereby enjoined and required to execute the same, commanding him, after due notice, to expose the same lands, or so much thereof as may be necessary to discharge the sum due, with interest and costs, to sale, and transmit the same to the Receiver-General of the Land-Office of this state; and the said Sheriff shall give the purchaser a deed for the land so by him sold, upon receipt of purchase money and interest.
64 P.S. § 33