We need not, however, go back five centuries for facts that bid men heed what may be passing underground about the shores of this blue bay. Here is one too large to be overlooked, immediately in front of us—no other than the green slope of Monte Nuovo, a hill of aspect both innocent and ancient, ridged with a few pine trees by whose aid the mountain contrives to look as if it had stood there beside the Lucrine Lake as long as any eminence in sight. This is a false pretension. There was no such mountain when Petrarch climbed the neighbouring height, nor for full two centuries afterwards. What Petrarch saw exists no longer. He looked down upon the Lucrine Lake connected with the sea by a deep channel, and formed with Lake Avernus into one wide inlet fit for shipping. This was the Portus Julius, a harbour so large that the whole Roman fleet could manœuvre in it. The canals and piers were in existence less than four centuries ago; and this great work, so remarkable a witness to the sea power of the Romans, would doubtless have lasted unto our day had it not been for the intrusion of Monte Nuovo, which destroyed the channels and reduced the Lucrine Lake to the dimensions of a sedgy duck pond.

The catastrophe is worth describing, for no other in historic times has so greatly changed the aspect of this coast or robbed it of so large a portion of its beauty. For full two years there had been constant earthquakes throughout Campania. Some imprisoned force was heaving and struggling to release itself, and all men began to fear a great convulsion. On the 27th of September, 1538, the earth tremors seemed to concentrate themselves around the town of Pozzuoli. More than twenty shocks struck the town in rapid succession. By noon upon the 28th the sea was retreating visibly from the pleasant shore beside the Lucrine Lake, where stood the ruined villa of the Empress Agrippina, and a more modern villa of the Anjou kings, who were used, like all their predecessors in Campania, to take their ease in summer among the luxuriant vegetation of the hills whose volcanic forces were believed to be lulled in a perpetual sleep.

For three hundred yards the sea fell back, its bottom was exposed, and the peasants came with carts and carried off the fish left dry upon the strand. The whole of the flat ground between Lake Avernus and the sea had been heaved upwards; but at eight o'clock on the following morning it began to sink again, though not as yet with any violence. It fell apparently at one spot only, and to a depth of about thirteen feet, while from the hollow thus formed there burst out a stream of very cold water, which was investigated cautiously by several persons, some of whom found it by no means cold, but tepid and sulphurous. Ere long those who were examining the new spring perceived that the sunken ground was rising awfully. It was upreared so rapidly that by noon the hollow had become a hill, and as the new slopes swelled and rose where never yet had there been a rising ground, the crest burst and fire broke out from the summit.

"About this time," says one Francesco del Nero, who dwelt at Pozzuoli, "about this time fire issued forth and formed the great gulf with such a force, noise, and shining light that I, who was standing in my garden, was seized with great terror. Forty minutes afterwards, though unwell, I got upon a neighbouring height, and by my troth it was a splendid fire, that threw up for a long time much earth and many stones. They fell back again all round the gulf, so that towards the sea they formed a heap in the shape of a crossbow, the bow being a mile and a half and the arrow two-thirds of a mile in dimensions. Towards Pozzuoli it has formed a hill nearly of the height of Monte Morello, and for a distance of seventy miles the earth and trees are covered with ashes. On my own estate I have neither a leaf on the trees nor a blade of grass.... The ashes that fell were soft, sulphurous, and heavy. They not only threw down the trees, but an immense number of birds, hares, and other animals were killed."

Amid such throes and pangs Monte Nuovo was born, and the events of that natal day suggest hesitation before we label any crater of the Phlegræan fields with the word "extinct." It is granted that in the course of geologic ages volcanic forces do expend themselves. The British Isles, for instance, contain many dead volcanoes, once at least as formidable as any in the world. But the exhaustion has been the work of countless ages, and many generations of mankind will come and go upon this planet before the coasts of Baiæ and Misenum are as safe as those of Cumberland.

While speaking of these terrors, I have been halting by the wayside at a point, not far beyond the outskirts of Pozzuoli, where two roads unite, the one going inland beneath the slope of Monte Barbaro, the other following the outline of the curved shore on which Baiæ stands. The inland road is the one which goes to Cumæ, and is entitled to respect, if not to veneration, as being among the oldest of Italian highways, the approach to the most ancient Greek settlement in Italy, mother city of Pozzuoli and of Naples, not to mention the mysterious Palæopolis, whose very existence has been disputed by some scholars. Some say it was more than ten centuries before Christ's birth that the bold Greeks of Eubœa came up this coast, where already their kinsmen were known as traders, and having settled first on Ischia moved to the opposite mainland, and built their acropolis upon a crag of trachyte which overhung the sea. Their life was a long warfare. More than once they owed salvation to the aid of their kinsmen from Sicilian cities, yet they made their foundation a mighty power in Italy. With one hand they held back the fierce Samnite mountaineers who coveted their wealth, and gave out with the other more and more freely that noble culture which has had no rival yet.

One must wonder why these strangers coming from the south passed by so many gulfs and harbours shaped out of the enduring rock only to choose a site for their new city at the foot of all these craters. It may be that chance had its part in the matter; in some slight indication of wind or wave they may have seen the guidance of a deity. Indeed, an ancient legend says their ships were guided by Apollo, who sent a dove flying over sea to lead them. But again, the fires of the district were sacred in their eyes. The subterranean gods were near at hand, and on the dark shore of Lake Avernus they recognised the path by which Ulysses sought the shades. The mysteries of religion drew them there, and the cave of the Cumæan sibyl became the most venerated shrine in Italy. Lastly, one may perceive that the volcanic tract, full of terrors for the Etruscan or Samnite mountaineer who looked down upon its fires from afar, must have made attack difficult from the land.

Greek cities, such as Cumæ, studded the coast of southern Italy. "Magna Græcia" they called the country; and Greek it was, in blood, in art, and language. How powerful and how rich is better understood at Pæstum than it can be now at Cumæ, where, with the single exception of the Arco Felice, there remains no dignity of ruin, nothing but waste, crumbling fragments, half buried in the turf of vineyards. Such shattered scraps of masonry may aid a skilful archæologist to imagine what the city was; but in the path of untrained men they are nothing but a hindrance, and anyone who has already in his mind a picture of the greatness of Eubœan Cumæ had better leave it there without attempt to verify its accuracy on the spot.

Observations similar to these apply justly to most of the remaining sights in this much-vaunted district. The guides are perfectly untrustworthy. They give high-sounding names to every broken wall, and there is not a burrow in the ground which they cannot connect with some name that has rung round the world. It is absolutely futile to hope to recapture the magic with which Virgil clothed this country. The cave of the Sibyl under the Acropolis of Cumæ was destroyed by the imperial general Narses when he besieged the Goths. The dark, wet passage on the shore of Lake Avernus, to which the name of the Sibyl is given by the guides, is probably part of an old subterranean road, not devoid of interest, but is certainly not worth the discomfort of a visit. The Lake of Avernus has lost its terrors. It is no longer dark and menacing, and anyone may satisfy himself by a cursory inspection that birds by no means shun it now.

The truth is that this region compares ill in attractions with that upon the other side of Naples. In days not far distant, when brigands still invested all the roads and byways of the Sorrento peninsula, strangers found upon the Bay of Baiæ almost the only excursion which they could make in safety; and imbued as every traveller was with classical tradition, they still discovered on this shore that fabled beauty which it may once have possessed. There is now little to suggest the aspect of the coast when Roman fashion turned it into the most voluptuous abode of pleasure known in any age, and when the shore was fringed with marble palaces whose immense beauty is certainly not to be imagined by contemplating any one of the fragments that stud the hillside, though it may perhaps be realised in some dim way by anyone who will stand within the atrium of some great house at Pompeii, say the house of Pansa, who will note the splendour of the vista through the colonnaded peristyle, and will then remember that the Pompeiian houses were not famed for beauty, while the palaces of Baiæ were.