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They have flat, slightly inclined summits, and are, on an average, about six hundred feet in height; they present their steepest slope towards the interior of the island, from which point they radiate outwards, and are separated from each other by broad and deep valleys, through which the great streams of lava, forming the coast-plains, have descended.
The rocks of a feldspathic nature being anterior in origin to the basaltic strata, which cap them, as well as to the basaltic streams of the coast-plains, accords with the usual order of succession of these two grand divisions of the volcanic series.
But how the whole mass of shingle on the coast-plains has been transported from the mountains of the interior, is another and more difficult question. The following considerations, however, show that the sea by its ordinary action has considerable power in distributing pebbles. I could even distinguish particles of the gallstone-yellow porphyry.
These strata differ from the streams of basaltic lava forming the coast-plains, only in being more compact, and in the crystals of augite, and in the grains of olivine being of much greater size; characters which, together with the appearance of the associated calcareous beds, induce me to believe that they are of submarine formation.
But nowhere did their dominion reach into the interior; and even on the coast they exercised scarcely a nominal sway over the inhospitable shore-belt between Istria and Epirus, which, with its wild series of mountain-caldrons broken neither by river-valleys nor by coast-plains and arranged like scales one above another, and with its chain of rocky islands stretching along the shore, separates more than it connects Italy and Greece.
But nowhere did their dominion reach into the interior; and even on the coast they exercised scarcely a nominal sway over the inhospitable shore-belt between Istria and Epirus, which, with its wild series of mountain-caldrons broken neither by river-valleys nor by coast-plains and arranged like scales one above another, and with its chain of rocky islands stretching along the shore, separates more than it connects Italy and Greece.
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