of San Felipé, the earth is impregnated, in many places, with nitrate of potash or nitre. Mineral waters and thermal springs exist on the southern slope of the Cerro del Cubilete, near Silao, and are used by invalids; while in the jurisdictions of Leon, near Irapuato or San Miguel Allende and Celaya, other warm and sulphur springs are found which are beneficially frequented by persons who suffer from rheumatism and cutaneous diseases.
THE STATE OF ZACATECAS.
This rich metallic region and State lies between the 21st and 25th degrees of north latitude and 1021/2 and 1051/2 west longitude from Paris. It is bounded on the north by Durango and Nuevo Leon on the east by San Luis Potosi; on the south-east by Guanajuato; and on the west and south-west by Jalisco. Its greatest breadth, from Sombrereté to Real del Ramos, in the State of San Luis, is fifty-seven leagues, and its extreme length is 90. The superficial area of the State is reckoned at 2,355 square leagues.
Zacatécas is a mountain country of the high plateau of Mexico, cut up by spurs of the Cordillera and inhospitably arid. The region between Catorcé in San Luis Potosi, and Sombrereté and Mazapil in Zacatécas is a broad plain, interspersed by a few