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treating this branch of our subject we have followed the order adopted by Mühlenpfordt in his "Republik Mejico," and acknowledge the important assistance we have derived from the careful, minute and laborious personal researches made by that industrious German author relative to the geography of Mexico. Since the publication of his volumes, in which he had been greatly aided by the previous works of Humboldt, Ward, Burkhardt and other explorers during the present century, the Mexican government has organized a Statistical Commission, whose investigations have been published in a series of Bulletins, and to these we are indebted for recent authentic information about some of the most interesting portions of Mexico. The northern regions, meanwhile, have been illustrated by the explorations of Frémont, Abert, Emory, Wislizenius, Cooke, Simpson, and other officers of the American Government; but as most of the territory examined by them has become the property of the United States by the Treaty of Guadalupe, their labors are not of importance in describing the Republic of Mexico as at present bounded. In the last Book of this work, however, which we have devoted to the consideration of California and New Mexico, we shall recur to those brave and scientific explorers of a remote region, so recently a wilderness, but which their labors, and