“Our slates and granites are often of very lovely colors; but the Apennine limestone is so gray and toneless, that I know not any mountain district so utterly melancholy as those which are composed of this rock, when unwoodcd. Now, as far as I can discover from the internal evidence in his poem, nearly all Dante’s mountain wanderings had been upon this ground. He had journeyed once or twice among the Alps, indeed, but seems to have been impressed chiefly by the road from Garda to Trent, and that along the Cornice, both of which are either upon those limestones, or a dark serpentine, which shows hardly any color till it is polished. It is not ascertainable that he had ever seen rock scenery of the finely colored kind, aided by the Alpine mosses: I do not know the fall at Forli ( Inferno , XVI