From the more elevated summit, all the inner part of the burning crater, and the mode of its eruption, may be seen. It is placed about half-way up, on the north-west side of the mountain, and has a diameter not exceeding two hundred and fifty feet. Burning stones are thrown up at regular intervals of seven or eight minutes, ascending in somewhat diverging rays. While a portion of them roll down toward the sea, the greater part fall back into the crater; and these being again cast out by a subsequent eruption, are thus tossed about until they are broken and reduced to ashes. The volcano, however, constantly supplies others, and seems inexhaustible in this species of productions. Spallanzani affirms that, in the more violent eruptions, the ejected matter rises to the hight of half a mile, or even higher, many of the ignited stones being thrown above the highest summit of the mountain. The erupted stones, which appear black in the day-time, have at night a deep red color, and sparkle like fire-works. Each explosion is accompanied by flames or smoke, the latter resembling clouds, in the lower part black, in the upper white and shining, and separating into globular and irregular forms. In particularly high winds from the south or south-east, the smoke spreads over every part of the island. Spallanzani observed this volcano on a particular night, when the latter of these winds blew with great violence. The clear sky exhibited the appearance of a beautiful aurora borealis over that part of the mountain on which the volcano is situated, and which from time to time became more red and brilliant, in proportion as the ignited stones were thrown to a greater hight. The violence of the convulsions depends on that of the wind.