Vesuvius is the most deceptive of mountains. We know how treacherous and cruel he is. But as we see him gently smoking, in the haze of this soft, enervating atmosphere, we think him very much maligned. The chimney of a well-regulated house could not be steadier of behavior. His sides look sleek in the distance. One would never suspect that all that brown softness is lava, fifty feet deep, and covering thousands of acres. When I ascended the volcano, I realized how illusory are impressions when formed afar off. After traversing Portici and Resina (old Herculaneum), the carriage climbed a steep slope between country villas with “plenty of fruit and shade,” as the advertisement of a country-house to let would say. Presently a sharp turn in the road brought me face to face with the head of a lava-stream which had been mercifully stayed at that point years ago. The road had been cut through it, showing its depth, and that was enough to have buried in its path any of the villas I had seen below. From this point on to the station of the Funicular Railway the road for the most part passes between gray-black walls of lava, the tops of which are curled like waves or twisted into capricious spiral forms, and then forever stilled. Not a flower or blade of grass grows there, except in crevices where dust may have fallen and the wind has scattered seeds.
The desolation, mile after mile, is oppressive to behold. One seeks relief by looking back over the blue Mediterranean and the reddish-white cities of the plain. Or else he looks ahead and up to Vesuvius, whose terrible majesty now begins to appear. I now see that where the sea of lava ends the ashes begin. The vapor, which seemed to curl so peacefully and thinly, from the standpoint of Naples, is mounting to the sky in a great volume, and whirling as if in a cyclone. One imagines a roar as that hot steam rushes from the crater. He sees specks tossed into the air. These are stones flung aloft two hundred to three hundred feet, and dropped back into the yawning pit to be presently ejected again. He has been told that Vesuvius is a little more active than usual. He can now readily understand of what frightful deeds the volcano is capable when in the maddest humor. Not only all the little cities near his base, which have been rebuilt in the childlike faith that they will never again be destroyed, but proud Naples, which has so far been spared, are at his mercy.
After I had ascended by railway to a nearer view of the monster, and completed my acquaintance with him as far as it was safe, familiarity did not lessen my respect for his power. It seemed impudently inquisitive for a party of tiny mortals to be throwing stones into his enormous mouth, poking canes into his ribs and stirring up the red fire there, and laughing as the dense, sulphurous fumes rose in our faces. The guides roasted eggs for us, and we ate them with a pinch of salt, chucking the shells into the crater, which answered back with a shower of red-hot stones. These luckily missed their mark. I incline to think that some of the fun made by our company of visitors was like whistling to keep up one’s courage; for I noticed that the noisiest of them clung hard to the guides and gave a wide berth to the crater’s edge, and looked most pleased when the signal was given to return. Just as we started on the downward path, Vesuvius made a noise between a sob and a shriek, and belched forth a farewell volley of stones, which might have spoiled some hats, and even heads, if they had been shot accurately.
For the information of those who have never ascended Vesuvius but hope to do so some day, I add that the trip by carriage from Naples is three and one-half hours long to the foot of the Funicular Railway. Thence to the upper station is a ride of twelve minutes, by a line much resembling that of Mount Washington or the Righi, in ease and safety. From there to the top of the crater is a steep climb of fifteen or twenty-five minutes, according to the age and wind of the climber. Persons with weak lungs or shaky legs, or in any respect infirm, should not attempt the latter feat. For them is provided the chaise-porte. Two strong young fellows carry this like a bier—their customer sitting composedly (unless he or she is badly scared) in the chair which is swung in the middle of two long poles. The bearers are like goats in sure-footedness, strength, and agility. It is wonderful to see them pick their way among the huge, jagged pieces of smoking lava and up the steep slope of hot ashes, ankle-deep, without slipping. In an hour one may do reasonable justice to the cone and crater, and in two hours and a half more be back in Naples.
On my way down the mountain I profited by a little spare time to do what most tourists omit: I visited the observatory. This building is securely placed on a spur of Vesuvius where the lava-wave parts in its destructive course. Here dwell day and night, all the year round, an accomplished scientist and an able staff, whose duty it is to note all the phenomena of eruptions and earthquakes. In reality most of the work is done for them by instruments of almost inconceivable delicacy and precision, and they have only to keep these in perfect order. This exquisite automatic apparatus reports everything the world wants to know about earthquakes except their cause. They give the direction of the movement, its speed and intensity and duration. Though the man who climbs to the crater does not observe the faintest throb beneath his feet when the volcano is most active, there is a little tell-tale machine down in the observatory which vibrates passionately at that precise moment. It is not at rest five minutes together during the whole day. If the motion of the trembling is horizontal, then a hollow brass ball swings toward the north, south, east, and west, as the case may be. This indicates unerringly the direction of the earthquake-wave. If the motion is vertical, then a spiral coil of fine wire visibly shortens and springs back again. Every discharge of stones from the crater above causes an extraordinary agitation of the wire. You see the shower and the sympathetic action of this sensitive coil at the same instant. The director invites you to dance a jig on the floor, within a foot of the wire, to show that its movements correspond only to actual tremblings of old Mother Earth. You do so, jumping as high as you can. But the apparatus makes no sign. The heavy rumbling of a wagon in the road outside does not disturb it. The “seismograph,” as it is called, does only the work for which it was designed. The director, however, was good enough to switch off its connection from the bowels of the earth to my pulse. No doctor with hand on wrist could have counted the beats more accurately. They were more regular than those of Vesuvius, if not quite as fierce. Out of the millions of observations taken here in the course of years, it is hoped that some time an exact science of earthquakes may be constructed, with possible usefulness to mankind. For three or four days before the appalling calamity in Ischia (just off this coast) in 1883, all the apparatus of the observatory was greatly excited. Something frightful was brewing. That was evident to the watchers up there. The world knows the result. If it could have been foretold in time to save hundreds of lives on that unhappy island, that would indeed have been a triumph of science.
At the center of the old volcanic district west of Naples is the great crater of Solfatara, not yet quite extinct. Eight centuries ago it was active and destructive; now it is full of stunted bushes and tall grass. The sulphurous vapor rising from a hole about three feet in diameter, on one side of the vast bowl, shows that a fire still burns in its bosom. One can not see the red-hot lava in the crevices, as on Vesuvius. But if the hand is held in the ascending steam for a moment, a scalding heat is felt. The guide who conducted me about the crater actually crawled into this hole at a point where it could be entered horizontally. To escape suffocation he covered his mouth with his hand and kept close to the ground. After about a minute of anxiety on my part, he returned with fine specimens of sulphuric deposits exactly like those I had seen fringing some of the chinks in the burning flank of Vesuvius. The offensive smell and acrid taste of the vapor which poured forth incessantly from this subterranean passage were the same that make an ascent of the Vesuvian cone so trying to many persons. The guide assured me that the connection between Solfatara and the great volcano on the Bay of Naples was intimate and instant. Whenever Vesuvius is inactive, Solfatara “works” quite fiercely. Whenever Vesuvius is very active, Solfatara is disappointing. It would seem from this statement that, though the mountains are miles apart, they both communicate with a common reservoir of molten matter.
There is no certainty that Solfatara will not break out again. There have been periods of centuries between the eruptions of Vesuvius; and it is a recorded fact that at times its crater has been lined inside with foliage, so reduced was its capacity for mischief. As there is no present prospect that tourists can descend in safety to the floor of its crater and study minutely the phenomena which can not be fairly seen from the rim, they should not fail to visit Solfatara. They will not burn the soles of their boots, and yet they can, if they please, roast eggs by digging down about a foot in places indicated by the guide. They can realize the thinness of the crust over which they walk by raising a large stone and throwing it down violently. The ground gives back a hollow sound. It is true that Solfatara does not eject red-hot stones, even the smallest. But that is a point in its favor, enabling the visitor to look on with a sense of perfect safety. There is but one Vesuvius. No other volcano is as accessible, or offers as many advantages for all kinds of observations. But if one is at Naples, and does not care to incur the fatigue or other discomforts of an ascent of Vesuvius, Solfatara is a good substitute excursion and is hereby recommended; and, as something supplementary to the greater event, it is also of much interest.