Some ten years ago I contributed to a book on His toric Towns, published by G. P. Putnam's Sons, of New York and London, a brief historical Sketch of Pittsburgh. The approach of the one hundred and fif tieth anniversary of the founding of Pittsburgh, and the elaborate celebrations planned in connection there with, led to many requests that I would reprint the sketch in its own covers as a souvenir of the occasion. Finding it quite inadequate for permanent preserva tion in its original form, I have, after much research and painstaking labor, rewritten the entire work, add ing many new materials, and making of it what I be lieve to be a complete, though a short, history of our city. The story has developed itself into three natural divisions: historical, industrial, and intellectual, and the record will Show that under either one of these.