This part of the subject may be concluded with observing—­that, from the multitude of brooks and torrents that fall into these lakes, and of internal springs by which they are fed, and which circulate through them like veins, they are truly living lakes, ’vivi lacus;’ and are thus discriminated from the stagnant and sullen pools frequent among mountains that have been formed by volcanoes, and from the shallow meres found in flat and fenny countries.  The water is also of crystalline purity; so that, if it were not for the reflections of the incumbent mountains by which it is darkened, a delusion might be felt, by a person resting quietly in a boat on the bosom of Winandermere or Derwent-water, similar to that which Carver so beautifully describes when he was floating alone in the middle of lake Erie or Ontario, and could almost have imagined that his boat was suspended in an element as pure as air, or rather that the air and water were one.

Having spoken of Lakes I must not omit to mention, as a kindred feature of this country, those bodies of still water called TARNS.  In the economy of Nature these are useful, as auxiliars to Lakes; for if the whole quantity of water which falls upon the mountains in time of storm were poured down upon the plains without intervention, in some quarters, of such receptacles, the habitable grounds would be much more subject than they are to inundation.  But, as some of the collateral brooks spend their fury, finding a free course toward and also down the channel of the main stream of the vale before those that have to pass through the higher tarns and lakes have filled their several basins, a gradual distribution is effected; and the waters thus reserved, instead of uniting, to spread ravage and deformity, with those which meet with no such detention, contribute to support, for a length of time, the vigour of many streams without a fresh fall of rain.  Tarns are found in some of the vales, and are numerous upon the mountains.  A Tarn, in a Vale, implies, for the most part, that the bed of the vale is not happily formed; that the water of the brooks can neither wholly escape, nor diffuse itself over a large area.  Accordingly, in such situations, Tarns are often surrounded by an unsightly tract of boggy ground; but this is not always the case, and in the cultivated parts of the country, when the shores of the Tarn are determined, it differs only from the Lake in being smaller, and in belonging mostly to a smaller valley, or circular recess.  Of this class of miniature lakes, Loughrigg Tarn, near Grasmere, is the most beautiful example.  It has a margin of green firm meadows, of rocks, and rocky woods, a few reeds here, a little company of water-lilies there, with beds of gravel or stone beyond; a tiny stream issuing neither briskly nor sluggishly out of it; but its feeding rills, from the shortness of their course, so small as to be scarcely visible.  Five or six cottages are reflected in its peaceful