Perhaps The Most Remarkable Curiosity Of This Kind In New England Is The Well-Known Basin On The Pemigewasset, One Of The Head-Waters Of This River, Twenty By Thirty Feet In Extent And Proportionably Deep, With A Smooth And Rounded Brim, And Filled With A Cold, Pellucid, And Greenish Water.

At Amoskeag the river is divided into many separate torrents and trickling rills by the rocks, and its volume is so much reduced by the drain of the canals that it does not fill its bed.

There are many pot-holes here on a rocky island which the river washes over in high freshets. As at Shelburne Falls, where I first observed them, they are from one foot to four or five in diameter, and as many in depth, perfectly round and regular, with smooth and gracefully curved brims, like goblets. Their origin is apparent to the most careless observer. A stone which the current has washed down, meeting with obstacles, revolves as on a pivot where it lies, gradually sinking in the course of centuries deeper and deeper into the rock, and in new freshets receiving the aid of fresh stones, which are drawn into this trap and doomed to revolve there for an indefinite period, doing Sisyphus-like penance for stony sins, until they either wear out, or wear through the bottom of their prison, or else are released by some revolution of nature. There lie the stones of various sizes, from a pebble to a foot or two in diameter, some of which have rested from their labor only since the spring, and some higher up which have lain still and dry for ages, - we noticed some here at least sixteen feet above the present level of the water, - while others are still revolving, and enjoy no respite at any season. In one instance, at Shelburne Falls, they have worn quite through the rock, so that a portion of the river leaks through in anticipation of the fall. Some of these pot-holes at Amoskeag, in a very hard brown-stone, had an oblong, cylindrical stone of the same material loosely fitting them. One, as much as fifteen feet deep and seven or eight in diameter, which was worn quite through to the water, had a huge rock of the same material, smooth but of irregular form, lodged in it. Everywhere there were the rudiments or the wrecks of a dimple in the rock; the rocky shells of whirlpools. As if by force of example and sympathy after so many lessons, the rocks, the hardest material, had been endeavoring to whirl or flow into the forms of the most fluid. The finest workers in stone are not copper or steel tools, but the gentle touches of air and water working at their leisure with a liberal allowance of time.

Not only have some of these basins been forming for countless ages, but others exist which must have been completed in a former geological period. In deepening the Pawtucket Canal, in 1822, the workmen came to ledges with pot-holes in them, where probably was once the bed of the river, and there are some, we are told, in the town of Canaan in this State, with the stones still in them, on the height of land between the Merrimack and Connecticut, and nearly a thousand feet above these rivers, proving that the mountains and the rivers have changed places. There lie the stones which completed their revolutions perhaps before thoughts began to revolve in the brain of man.

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