miles high, and sixty in compass. There are many of its furious eruptions recorded in history, some of which have proved very fatal to the neighbourhood; we shall instance only one, that began the 11th of March, 1669, and is thus described in the Philosophical Transactions, viz.
It broke out towards the evening, on the south-east side of the mountain, about twenty miles from the old mouth, and ten from the city of Catanea. The bellowing noise of the eruption was heard a hundred miles off, to which distance the ashes were also carried. The matter thrown out was a stream of metal and minerals, rendered liquid by the fierceness of the fire, which boiled up at the mouth like water at the head of a great river; and having run a little way, the extremity thereof began to crust and cruddle, turning into large porous stones, resembling cakes of burning sea-coal. These came rolling and tumbling one over another, bearing down any common building by their weight, and burning whatever was combustible. At first the progress of this inundation was at the pace of three miles in 24 hours, but afterwards scarcely a furlong in a day. It thus continued for fifteen or sixteen days together, running into the sea close by the walls of Catanea, and at length over the walls into the city, where it did no considerable damage, except to a convent, which it almost destroyed.
In its course it overwhelmed fourteen towns and villages, containing three or four thousand inhabitants; and it is very remarkable, that (during the whole time of this eruption, which was fifty-four days), neither sun nor stars appeared.
But though Catanea had at this time the good fortune to escape the threatened destruction, it was almost totally ruined in 1692 by an earthquake, one of the most terrible in all history. This was not only felt all over Sicily, but likewise in Naples and Malta. The shock was so violent, that the people could not stand on their legs, and those that lay on the ground were tossed from side to side, as if upon a rolling billow. The earth opened in several places, throwing up large quantities of water, and great numbers perished in their houses by the fall of rocks, rent from the mountains. The sea was violently agitated, and roared dreadfully. Mount Ætna threw up vast spires of flame, and the shock was attended with a noise exceeding the loudest claps of thunder. Fifty-four cities and towns, with an incredible number of villages, were destroyed, or greatly damaged; and it was computed, that near 60,000 people perished in different parts of the island, very few escaping the general and sudden destruction.
There have been ten other eruptions, one of which, subsequent to the preceding in 1753, was a very large one. Mr. Brydone, in his tour of Sicily and Malta, has given many ingenious particulars concerning it.
Explanation of NUMBERS expressed by Letters.
N.B.
A less Numerical Letter, set before a greater, takes away from the greater so many as the letter stands for; but being set after the greater, adds so many to it as the letter stands for. For example, V stands for five alone, but put I before it, thus IV, and it stands for four; and put I on the other side, thus VI, and it stands for six. So X alone stands for ten, but put I before it, thus IX, and it stands for nine; and put I to it on the other side, thus XI, and it becomes eleven. So L stands for fifty; put X before it, thus XL, and it stands for forty, but put the X on the other side, thus LX, and it is sixty. So C stands for one hundred, place X before it, thus XC, and it is but ninety; again, put the X on the other side, thus CX, and it is one hundred and ten. So in all other cases.