With all its curiosity the Dog Grotto is a deadly little hole, in which the world takes much less interest nowadays than it does in many other objects in the neighbourhood of the Siren city, going indeed by preference to see those which are beautiful, whereas not many generations ago it rushed off hastily to see first those which are odd. For that reason many visitors to Naples neglect this region of the Phlegræan fields and are content to wait the natural occasion for visiting the mouth of Styx, over which all created beings must be ferried before they reach the nether world. It is a pity; for, judged from the point of beauty solely, there is enough in the shore of the Bay of Baiæ to content most men. The road mounts upon the ridge which parts the slope of Lago d'Agnano from the sea. One looks down from the spine over a broken land of vineyards to a curved bay, an almost perfect semicircle, bounded on the left by the height of Posilipo, with the high crag of the Island of Nisida, and on the right by Capo Miseno, the point which took its name from the old Trojan trumpeter who made the long perilous voyage with Æneas, but perished as he reached the promised land where at last the wanderers were to find rest. The headland, which, like every other eminence in sight, is purely volcanic, is a lofty mass of tufa, united with the land by a lower tongue, like a mere causeway; and on the nearer side stands the Castle of Baiæ, with the insignificant townlet which bears on its small shoulders the burden of so great a name. Midway in the bay the ancient town of Pozzuoli nestles by the water's edge, deserted this long while by all the trade which brought it into touch with Alexandria and many another city further east, filling its harbour with strange ships, crowding its quays with swarthy sailors, and with silks and spices of the Orient. All that old consequence has gone now like a dream, and no one visits the cluster of old brown houses for any other reason than to see that which is still left of its ancient greatness. But before going down the hill, I turn aside towards a gateway on my right, which admits me to a place of strange and curious interest. It is the Solfatara, and is nothing more or less than the crater of a half-extinct volcano, which, having lain torpid for full seven centuries, is now a striking proof of the fertility of volcanic soil, and the speed with which Nature will haste to spread her lushest vegetation even over a thin crust which covers seething fires. It was so once with the crater of Vesuvius, which, after five centuries of rest, filled itself with oaks and beeches, and covered its slopes with fresh grass up to the very summit.