The chain of mountains running through the centre of the island, more or less broken in its course, is lofty in the east, but gradually diminishes in elevation towards the west, until it becomes a series of gently undulating hills of one or two hundred feet above sea level, ceasing as a connected range in the vicinity of Matanzas. On the easterly end this range of mountains approaches the south coast between Puerto Principe and Trinidad. The country lying between Cape Cruz, Cape Maysi, and the town of Holguin has the highest elevations; the most lofty point, Turquino, lately measured, has a height of ten thousand eight hundred feet. Illustrative of the great revolutions which the globe has undergone in its several geological epochs, petrified shells and bivalves are found on the summits of these highest peaks, surrounded by coral rocks, both of which differ entirely from those at present existing on the shores of the Antilles. An immense bowlder was pointed out to us on the summit of La Gran Piedra, at an elevation of five thousand feet, of totally different composition from any other rocks on the island. The great mystery is how such a mass of solid stone could have got there. Most of these mountains are thickly wooded, some of them to their very tops, and appear to be in a perpetual state of verdure. There are mahogany trees in these hills reported to be of almost fabulous dimensions, besides other trees of great age. Some idea of the excellence of the timber grown in Cuba may be had from the fact that over one hundred Spanish ships of war--some of which were of the largest size, mounting a hundred and twenty guns--have been built from native stock at the port of Havana. Copper ore is found in abundance, as well as silver and iron, in the mountains. Snow is never known to fall even in these elevated districts, and of course in no other part of the island. In the interior, the extreme heat of the low-lying sea-coast and cities is not experienced, and the yellow fever is unknown. Low, level swampy land is found only on the southern coast, where there are some wild deer, wild cats and dogs, which are hunted; the former introduced into Cuba half a century since, the two latter descended from domestic animals. Large tracts of undulating country are without trees, affording good pasturage. In some of the mountains are extensive caves, not unlike the caves of Bellamar near the city of Matanzas, in which are still to be found the bones of an unknown race, while several of these elevations are so precipitous as to be nearly inaccessible.