The result of their inquiries, when combined with the statistical information which the governments of the different States are labouring to collect, and the military surveys of the Estado Mayor, will be extremely valuable; and many years will, probably, not elapse, before the interior of Mexico will be as well known as that of most countries in the Old World.
The territory of Mexico presents, according to Humboldt, a surface of 118,478 square leagues, of twenty-five to the degree; but this estimate does not include the space between the Northern extremity of New Mexico and Sŏnōră, and the boundary line, as fixed more recently by the treaty of Washington, the extent of which is not yet well ascertained. Thirty-six thousand five hundred square leagues, comprising the states of Zăcătēcăs, Guădălajāră, Guănăjūātŏ, Vāllăadŏolīd, Mēxĭcŏ, La Pūēblă, Vĕrăcrūz, Oăxācă, and Mērĭdă, are within the Tropics, or, what is usually denominated, the torrid zone; while New Mexico, Dŭrāngŏ, New and Old California, Sŏnōră, and a great part of the old Intendancy of San Luis Pŏtŏsī, containing, in all,
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of the United Mexican Association, both of whom have been indefatigable in their researches. Captain Vetch has nearly completed a very valuable map of the interior of the country; and Mr. Glennie possesses a series of observations, taken by himself, which extend from Ŏăxācă, (100 leagues to the S.W. of Mexico,) to Chĭhūāhuă, and Gūāymăs, a port on the northern extremity of the Gulph of California.
