vessel, moored in the current. The effective head of water is about twenty inches high. The water-wheel is twelve feet in diameter, and eighteen feet broad. The millstone is about thirty-eight inches in diameter, and {87} makes a hundred and twenty revolutions in the minute.
We came up with a family boat, the people in which had killed a deer. These animals often cross the river of their own accord; and frequently to elude the pursuit of dogs.
The days are warm, reminding me of the month of August in Scotland; the mornings and evenings are cool.
The ranges of hills that bound the view on both sides of the river are composed of horizontal strata of the coal field formation; a bed of this mineral lies at the height of fifty or sixty feet above the level of the water. A large mass of sandstone is above the coal. This may be observed for many miles along the banks. The ragged, and dented edges of the strata, have led some to suppose that the river never acted on them; but the very contrary must have been the case; for had the cliffs now to be seen been exposed to the weather ever since the commencement of the present order, their asperities, and sharp edges had been rounded off, and smoothed, as in the case of rocks on hill tops. The true explanation seems to be, that the river has undermined the rocks, brought them down, and ground them to sand, by its powerful attrition. The undermining process has no doubt been facilitated by the softer subjacent strata, as clay-schist, and coal. The powerful operation of the grinding process is strongly attested by the grooved surfaces, and the figure of the large blocks in the bed of the stream. These are uniformly rounded away on the end that lies farthest up the river;
