Note 539 — Chapter IV · EMIGRATION. GROWTH OF THE RIVER TOWNS.

Niles, Weekly Register, XXXII., 34.

Ibid., XXXI., 165. "The river remains low. But the number of heavily laden keels which arrive and depart daily, show that the improvements in the channel have been such as to secure us an uninterrupted navigation from Pittsburg westward, at the very lowest stages of the water."

Ibid., XXXIV., 411. "Pittsburg goes on prosperously. The happy union of the two arms of the American system will make her great, her manufactures and the location of the Pennsylvania Canal