A sign near the log school says the following: "John McMillan's Log School - This log structure was a frontier Latin school in the 1780s, located about a mile south of Canonsburg. It was moved to what had been the Jefferson College campus in 1895 as a symbol of Canonsburg's educational tradition."

The two signs on the log school say the following: "This log cabin was built in 1780 by the Rev. John McMillan D.D.[2] and was the beginning of Jefferson College. It was donated by his descendants, the Fulton brothers, to the Rev. William F. Brown D.D. who removed it to this campus in 1895, and committed it to the guardianship of the trustees of Jefferson Academy. By action of the board of trustees 1907, its perpetual care was entrusted to the college fraternity of Phi Gamma Delta, founded in Jefferson College in 1848, for the honor of the founders of the fraternity: Daniel Webster Crofts, Samuel Beatty Wilson, James Elliott, Naaman Fletcher, Ellis B. Gregg, John T. McCarty."

"In commemoration of the 100th anniversary of the founding in 1852 of Phi Kappa Psi on this campus. Phi Gamma Delta in convention assembled on August 30, 1952, invited its distinguished colleague of the Jefferson duo to share perpetually the custody of this historic log cabin."

According to page 2 of Helen Turnbull Waite Coleman's Banners in the Wilderness: The Early Years of Washington and Jefferson College (1956, University of Pittsburgh Press, OCLC 2191890), "John McMillan built a log building and made it a school, according to tradition about 1780. We know that James McGready was studing Latin with him there as early as 1783.(2) The historic log school which is still preserved in part at Canonsburg is the log structure that McMillan rebuilt after a fire of unknown date consumed his first building." On page 7, it goes on to say that, "McMillan's name stands first among the original trustees of Washington Academy when it was chartered in 1787, and he remained on its board until 1795... collected money for the school that was eventually located at Canonsburg. McMillan transferred his students to Canonsburg at an unknown date, and stood by it as teacher, officer, or friend until the end of his life."