ANAHUAC, the ancient Indian name of New Spain, or Mexico. The valley of Mexico, or Tenochtitlan, is, according to Humboldt, situated in the centre of the cordillera of Anahuac. This valley is of an oval form. Its length is 18-3/4 leagues, estimating from the entry of the Rio Tenango into lake Chalco to the foot of the Cerro de Sincoque, and 12-1/2 leagues in breadth, from St. Gabriel to the sources of the Rio de Escapusalco. Its territorial extent is 244-1/2 square leagues, of which only 22 square leagues are occupied by lakes, being less than a tenth of the whole surface. The circumference of the valley, estimating around the crest of the mountains, is 67 leagues. This crest is very elevated in most parts, and embraces the great volcanoes of La Puebla, Popocatepetl, and Iztacchihuatl. There are five lakes in this valley, of which, that of Tezcuco is the largest. All are much diminished in the quantity of water they yield, since the 16th century, which is owing, in part, to the destruction of trees by the Spaniards, but most directly to the canal of Huehuetoco, cut through a mountain, by which the waters are drawn into the river Panuco, and thus find their way into the Atlantic. By this work, the city of Mexico itself was freed from all effects of periodical inundation, and the site enlarged and rendered better suited to streets and carriages. The waters of lake Tezcuco are impregnated with muriate and carbonate of soda. Those of Xochimilco are the most pure and limpid. Humboldt found their specific gravity to be 1.0009, when distilled water at the temperature of 54 deg. Fahrenheit, was 1.000, and that of Tezcuco 1.0215. Of the five lakes mentioned, Xochimilco and Chalco contain 6-1/2 square leagues; Tezcuco, 10-1/10; San Christoval, 3-6/10; and Zumpango, 1-3/10. The valley is a basin, surrounded by an elevated wall of porphyry mountains. The bottom of this basin is 2,277 metres, or 7,468 feet above the sea. ANALCO, a settlement of Guadalaxara, in Mexico, containing 40 Indian families. ANASAGUNTAKOOK, a band of the Abenaki, on the sources of the Androscoggin, in Maine. ANCAMARES, a nation of Indians inhabiting the shores of the river Madera. They are very warlike and robust. In 1683 they attacked the Portuguese, and compelled them to give up the navigation of the river. They are divided into different tribes. The most numerous are the Ancamares, who inhabit the shores of the river Cayari. ANCAS, a nation of Indians in Peru, who, on the 6th January, 1725, were overwhelmed and destroyed by the ruins of a mountain which burst forth by an earthquake. Fifteen thousand souls perished on that occasion.