A singular feature resulting from the above may here be mentioned. By pursuing the course of the river, a short distance below, on the opposite bank, it will be seen that a large quantity of the earth introduced into the current by the falling of the banks, has been thrown up in large masses, forming new land, which, in a few seasons, becomes arable. That which is not thus deposited, as already stated, is transported below, dropping here and there on the way, until what is left reaches the Gulf, and is precipitated upon the 'bars' and 'delta,' at the mouth. It not unfrequently happens that planters along the river find themselves suddenly deprived of some of their acres, while one almost opposite finds himself as unexpectedly blessed with a bountiful increase of his domain. From causes almost similar to those given to explain the sudden and disastrous changes of the channel of the river, are also produced those singular shortenings, known as 'cut-offs,' which are so frequently met with on the Mississippi. At a certain point the force of the current is turned out of its path and impinged against a neck of land, that has, after years of resistance, been worn down to an exceedingly small breadth. Possibly the river has merely worn an arm in its side, leaving an extensive bulge standing out in the river, and connected with the mainland by an isthmus. The river striking in this arm, and not having sufficient scope to rebound toward the other bank, is thrown into a rotary motion, forming almost a whirlpool. The action of this motion upon the banks soon reduces the connecting neck, which separates and blocks the waters, until, at last, no longer able to cope with the great weight resting against it, it gives way, and the river divides itself between this new and the old channel. Nor do these remarkable instances of abrasive action constitute the entire washing from the banks. The whole length of the river is subject to a continual deposit and taking up of the silt, according to the buoyant capacity of the water. This, too, is so well regulated that the quantity of earthy matter held in solution is very nearly the same, being proportioned to the force of the current. For instance, if the river receive more earth than it can sustain, the surplus sediment drops upon the bottom or is forced up upon the sides. If the river be subject to a rise, a proportionate quantity of the dropped sediment is again taken up, and carried along or deposited again, according to the capacity of the water. By this means a well-established average of silt is at all times found buoyant in the river.