One may 'sense' the interval to his mind, after a fashion, by dividing it up in this way: After De Soto glimpsed the river, a fraction short of a quarter of a century elapsed, and then Shakespeare was born; lived a trifle more than half a century, then died; and when he had been in his grave considerably more than half a century, the SECOND white man saw the Mississippi.

In our day we don't allow a hundred and thirty years to elapse between glimpses of a marvel.

If somebody should discover a creek in the county next to the one that the North Pole is in, Europe and America would start fifteen costly expeditions thither: one to explore the creek, and the other fourteen to hunt for each other.
For more than a hundred and fifty years there had been white settlements on our Atlantic coasts.

These people were in intimate communication with the Indians: in the south the Spaniards were robbing, slaughtering, enslaving and converting them; higher up, the English were trading beads and blankets to them for a consideration, and throwing in civilization and whiskey, 'for lagniappe;' and in Canada the French were schooling them in a rudimentary way, missionarying among them, and drawing whole populations of them at a time to Quebec, and later to Montreal, to buy furs of them.

Necessarily, then, these various clusters of whites must have heard of the great river of the far west; and indeed, they did hear of it vaguely,--so vaguely and indefinitely, that its course, proportions, and locality were hardly even guessable.