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Rh desconocido"; and whole tribes of Indians that have never been brought in contact with the white man, and repel all attempts at visitation or government supervision.

During the three hundred years, also, when Mexico was under Spanish dominion, access to the country was almost absolutely denied to foreigners; the most noted exception being the case of Humboldt, who, through the personal favor and friendship of Don Marino Urquijo, first Spanish Secretary of State under Charles IV, received privileges never before granted to any traveler; and thus it is that, although more than three quarters of a century have elapsed since Humboldt