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We were much interested in Vesuvius, which, for several months, was in a state of great activity. At first, there were only volumes of smoke and some small streams of lava, but these were followed by the most magnificent projections of red hot stones and rocks rising 2,000 feet above the top of the mountain.
These reports rapidly swelled into the most enormous tales, and by the time they reached the New York newspapers, the expedition was "a great volcano about bursting, whose lava will burn, flow, and destroy," "the sudden appearance in arms of no less than five thousand negroes," "a liberating host," "not the phantom, but the reality, of servile insurrection."
After landing, we had a very rough walk over a rugged field of recent lava, which has almost surrounded a tuff-crater, at the bottom of which the salt-lake lies. The water is only three or four inches deep, and rests on a layer of beautifully crystallized, white salt.
Lava, not being so liquid as water, does not flow so rapidly: nevertheless, when it is careering down the sides of a mountain, or where the slope of the ground is considerable, it advances with great speed. Even when at its hottest, it is somewhat viscid, like treacle, and this viscidness increases as it cools.
The play of colors, from the first touches of the morning sun on the summit, down the snowfields and the ice and lava until the forests are aglow, is a never-ending delight, the rosy lava and the fine flushings of the snow being ineffably lovely. Thus one saunters on and on in the glorious radiance in utter peace and forgetfulness of time.
It remains only to confirm this reasoning, upon our principles, by bringing actual observation to its support; and this we shall do from two of the best authorities. The Chevalier de Dolomieu, in describing the volcanic productions of Etna, mentions a lava which had flowed from that mountain, and which may be considered as a granite.
"The open volcano beneath our feet," continued Marillac, who still stuck to his point, "warned us by deep rumblings of the hot lava which was about to gush forth. The excitement of the people was intense. Several engagements with the soldiers had already taken place at different points.
The summit of the small island is composed of a highly crystalline basalt; lower down I found a hard, stratified slatey sandstone, while on the beach are huge blocks of lava, and scattered masses of white coralline limestone. The larger island has coral rock to a height of three or four hundred feet, while above is lava and basalt.
No one can tell when the volcano was active, but from the nature of the crater it is perfectly clear that at one time it belched forth volumes of lava, which had a marked effect on the formation of the rock and the lay of the land of the surrounding country. Past the volcano, for many miles, the bright colors already referred to are supplanted by more sombre hues.
When Gale looked without his glass they merged into the roughness of the lava. He was intensely interested. Did the sheep see the red scarf? It seemed incredible, but nothing else could account for that statuesque alertness. The sheep held this rigid position for perhaps fifteen minutes. Then the leading ram started to approach. The others followed. He took a few steps, then halted.
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