Note 12 — Chapter I · ANCIENT MEXICO—CLIMATE AND PRODUCTS—PRIMITIVE RACES—AZTEC EMPIRE

Archbishop Lorenzana estimates the circuit of the Valley at ninety leagues, correcting at the same time the statement of Cortés, which puts it at seventy, very near the truth, as appears from the result of M. de Humboldt’s measurement, cited in the text. Its length is about eighteen leagues, by twelve and a half in breadth. (Humboldt, Essai politique, tom. ii. p. 29.—Lorenzana, Hist. de Nueva-España, p. 101.) Humboldt’s map of the Valley of Mexico forms the third in his “Atlas géographique et physique,” and, like all the others in the collection, will be found of inestimable value to the traveller, the geologist, and the historian.