This single mountain contains an epitome of the different climates throughout the world, presenting at once all the seasons of the year, and all the varieties of produce. It is accordingly divided into three distinct zones or regions, which may be distinguished as the torrid, temperate, and frigid, but which are known by the names of the cultivated region, the woody or temperate region, and the frigid or desert region. The former of these extends through twelve miles of the ascent toward the summit, and is almost incredibly abundant in pastures and fruit-trees of every description. It is covered with towns, villages and monasteries; and the number of inhabitants spread over its surface is estimated at one hundred and twenty thousand. In ascending to the woody or temperate region, the scene changes; it is a new climate, a new creation. Below, the heat is suffocating; but here, the air is mild and fresh. The turf is covered with aromatic plants; and the gulfs, which formerly ejected torrents of fire, are changed into woody valleys. Nothing can be more picturesque than this; the inequality of the soil displaying every moment some variety of scene: here, the ash and flowering thorns form domes of verdure; and there, the chestnut-trees grow to an enormous size. The one called =castagno de cento cavilli=, according to Brydone and Glover, has a circumference of two hundred and four feet. Many of the oaks also are of a prodigious size. Mr. Swinburne measured one which had a circumference of twenty-eight feet. The last, or desert region, commences more than a mile above the level of the sea. The lower part is covered with snow in winter only; but on the upper half of this sterile district the snows continually lie. [Illustration: THE “CASTAGNO DE CENTO CAVILLI,” OR GREAT CHESTNUT TREE OF MOUNT ETNA.]