There seems to be no reason why the great deposits of muck from the swamps which form the southern part of the Island, lying also along the coast of the mainland in many places, might not be transferred to those soils of the Isle of Pines lacking in humus, and thus in time build a foundation of sufficient fertility to produce almost any crop desired. In the northern half of the Isle of Pines are several low mountains, or ridges and hills, especially on either side of Nueva Gerona, which are composed largely of crystalline marble known as the Gerona marble. It is probable also that this same material forms part of the Sierra Pequena, or Little Ridge, located a few miles east, as well as that of the Sierra de Canada seen in the distance. This marble is thoroughly crystalline, retaining little or no trace of organism that it may originally have held. The greater part of it is rather coarse, although there are some beds of fine white statuary marble. The color varies from pure white to dark grey, with strongly marked banding in places. These rocks probably belong to the Paleozoic age, although the crystalline character of the material renders the period of their origin somewhat doubtful. In some beds the impurities of the original limestone have recrystallized and formed silicate minerals, chiefly fibrous hornblende. This deposit of marble has been estimated to be not less than 2,000 feet in thickness. The drinking water of the Isle of Pines is abundant, and like that of nearly all other parts of Cuba is of excellent quality. Several mineral springs exist which have a local reputation for medicinal properties. Many beautiful homes, and miles of splendid driveways, have been built by the property owners of the Isle of Pines, who have a natural pride in its beauty and development. To those pioneers from the United States who have done so much towards the regeneration and building up of this section, that has always been agriculturally despised, or at least ignored by the natives, the Government of Cuba feels greatly indebted, and it realizes fully that only through immigration of this kind will this excellent work be continued. Agricultural fairs, to which the Government of Cuba contributes a generous amount for prizes, are held each year in the Island, and social life among the residents, enlivened as it is by visitors from the north during the winter season, is said to be charming. The principal cities are Nueva Gerona and Santa Fe, while numberless small colonies are found every few miles along the highways that have been built within the last ten years. The Isle of Pines has an attractive future and many of the rosy dreams of the early American pioneers, with time, patience and capital, will undoubtedly be realized. CHAPTER XI MINES AND MINING