Pittsburgh is the front door of the valley of La Salle, as we now know the valley, and the most important door; for the tonnage that enters and leaves it by rail and water (177,071,238 tons in 1912 for the Pittsburgh district) exceeds the tonnage of the five other greatest cities of the world [Footnote: R. B. Naylor, address before the Ohio Valley Historical Association (quoted in Hulbert, "Ohio River," pp. 365-6).] and is twice the combined tonnage of both coasts of the United States to and from foreign ports--which is probably due to the fact that so much of its traffic is not in silks and furs but in iron and coal. And the multitudes of human beings that pass through it are comparable in number with the migrant tonnage and inanimate cargoes; for Pittsburgh is "the antithesis of a mediaeval town"; "it is all motion;" "it is a flow, not a tank." The mountains, once impenetrable barriers that had to be gone about, have been levelled, and in the levelling the watersheds, as we have seen, have been shifted. One who sees that throng pass to-day back and forth, to and from the valley and the ocean, must know that there are no Alleghanies in our continental topography, as Washington saw and as Webster stated there could not be in our politics. If one makes the journey from the ocean in the night, one may hear, if one wakes, the puffing of two engines, as in the Jura Mountains, but there will be nothing else to tell him that the shaggy Alleghany Mountains have not been cast into the midst of the sea-- nothing except the groaning of the wheels. The Indians near Pittsburgh, I have said, prayed the messenger of Onontio that they might keep their English smith--and the prayer seems to have been abundantly answered, for Pittsburgh appears at first to be one vast smithy, so enveloped is it in the smoke of its own toil, so reddened are its great sky walls by its flaming forges, so filled is the air with the dust from the bellows, and so clangorous is the sound of its hammers. It is a city of Vulcans--a city whose industry makes academic discussions seem as the play of girls in a field of flowers. It is not primarily a market-place, this point of land, one of the places where the French and English traders used to barter guns, whiskey, and trinkets for furs. It is a making place--a pit between the hills, where the fires of creation are still burning. Céloron and his sombre voyage had been in my mind all day, as I sat in a beautiful library of that city among books of the past; but in the evening, as Dante accompanied by Virgil, I descended circle by circle to the floor of the valley--with this difference, that it was not to a place of torment but to the halls of the swarth gods of creation, those great, dim, shadowy sheds that stretch along the river's edge. Into these, men of France, has your Fort Duquesne grown--mile on mile of flame-belching buildings, with a garrison as great as the population of all New France in the day of Duquesne.