There are no rivers in the northern part of the province, and only the rivers Champoton, and the Uzumacinta with its branches, in the south-western portion; but there are several small lakes in the centre of Yucatan, and a large number of artificial ponds in the central and southern districts. The scarcity of water is the one great natural difficulty to be surmounted in most parts of the country; but a supply can commonly be obtained by digging wells, though often at so great a depth that the cost is formidable. The result is that the number of wells is small, and in the cities of Mérida and Campeachy rain water is frequently stored in large cisterns for domestic purposes. From the existence of cenotes or ponds with an inexhaustible supply of water at the bottom of caves, and because water can be reached by digging and blasting, though with great effort and expense, the theory prevails in Yucatan that their territory lies above a great underground lake, which offers a source of supply in those sections where lakes, rivers and springs, are entirely unknown. A very healthful tropical climate prevails, and the year is divided into the wet and the dry season, the former beginning in June and lasting until October, the latter covering the remaining portions of the year. During the dry season of 1861-2, the thermometer ranged from 75° to 78° in December and January, and from 78° to 82° in February, March and April. Early in the dry season vegetation is luxuriant, the crops are ripening, and the country is covered with verdure; but as the season progresses the continued drouth, which is almost uninterrupted, produces the same effect upon the external aspect of the fields and woods as a northern winter. Most of the trees lose their leaves, the herbage dries up, and the roads become covered with a thick dust. During exceptionally dry seasons thousands of cattle perish from the entire lack of subsistence, first having exhausted the herbage and then the leaves and shrubbery. The population of the peninsula is now about 502,731, four-fifths of which are Indians and Mestizos or half-breeds. The general business of the country is agricultural, and the territory is divided into landed estates or farms, called haciendas, which are devoted to the breeding of cattle, and to raising jenniken or Sisal hemp, and corn. Cotton and sugar are also products, but not to an extent to admit of exportation. Some of the plantations are very large, covering an area of six or seven miles square, and employing hundreds of Indians as laborers.