Section, act June 27, 1906, ch. 3559, § 4, 34 Stat. 520, provided that settlers who had actually established themselves in town sites of Heyburn and Rupert, Idaho, prior to Mar. 5, 1906, in permanent buildings not easily moved, should be given right to purchase lots so built upon at an appraised value. Section was based on part of section 4 of act June 27, 1906. The remainder of section 4 is classified to sections 561 and 568 of this title.