Across the Schuylkill is Fat Land built by James Vaux; Washington slept here September 21, 1777; the next day, Sir William Howe came here and almost caught him. At Port Kennedy, one and one-half miles east of Valley Forge, prehistoric bones of sabretooth tigers and extinct animals are found. West of Valley Forge, Mill Grove, built, 1762, still standing, residence of John James Audubon; here he studied, painted, and wrote about “Birds of America” that have made him world-famous. Near, at the mouth of Perkiomen Creek, Washington’s army encamped at Richardson’s Ford, September 21, after marching all night, wet breast-high, and hungry, one thousand men without shoes. Howe moved on west of Schuylkill toward Reading, the depot of American supplies, having burned buildings at Valley Forge on his way, and reached Phœnixville, Fountain Inn. Washington marched his troops to Upper Hanover, within four miles of Pottstown; his headquarters was residence of John Potts, built 1753; and sent General Wayne with fifteen hundred men to harass the rear of British army under General Gray, but they were outnumbered by the British, and massacred at Paoli; marked by two monuments. [Illustration: PERKIOMEN BRIDGE, BUILT 1798, COLLEGEVILLE _Photograph by Fred P. Powers_] POTTSTOWN, founded by John Potts, population 17,431; noted for its iron industries since 1716; Mill Park Hotel, built, 1752, for residence of founder, who was visited here by Washington. Friends Meeting House, built, 1752, ground given by John Potts; he also gave ground for Zion Lutheran Church, Georgian, 1753. Residences of founder’s three sons, Dr. Jonathan Potts, Director General of Hospitals, Northern Department, in the Revolutionary War, “Stowe,” west of Pottstown; Samuel Potts, east of Pottstown, now “Hill School”; John Potts, Jr., a Tory judge, corner of High and Hanover Streets, center of town, later, residence of General Arthur St. Clair; Daughters of the American Revolution tablet on side. Emmanuel Lutheran Church, architects, Lechman & Murphy, windows from D’Ascenzo Studios; Christ Protestant Episcopal Church, Gothic; brownstone; good memorial windows; was received in Convention in 1827; Pottstown Hospital is controlled by Board of Women Managers, also the Library, in which art exhibitions are shown.