The Dee is a most picturesque river, from its source in Merionethshire to Chester; but its navigation at the mouth is somewhat difficult, owing to the large deposits of sand, which have to a great extent blocked up the channel.  Between Chester and the mouth are two nourishing towns, Holywell and Flint.  The chief wealth of Flintshire consists in its lead mines, which are very productive; and not only is lead dug up, but silver, of which about ten ounces is found in every ton of ore.  Flint has a castle; but it is not equal in picturesque beauty, we are told, to those we had already seen.