It was a maxim of the late Emperor Napoléon III., that France could go to war for an idea. The Spanish as discoverers were actuated by the love of gold, and the desire of extending the knowledge and influence of christianity, prominently by promoting the temporal and spiritual power of the mother church. In their minds the cross and the flag of Spain were inseparably connected. The French, however, claim to be ready to explore, investigate and study, for science and the discovery of truth alone. In addition to the _Commission Scientifique du Mexique_ of 1862, which was undertaken under the auspices of the French government, and which failed to accomplish all that was hoped, the Emperor Maximilian I. of Mexico projected a scientific exploration of the ruins of Yucatan during his brief reign, while he was sustained by the assistance of the French. The tragic death of this monarch prevented the execution of his plans; but his character, and his efforts for the improvement of Mexico, earned for this accomplished but unfortunate prince the gratitude and respect of students of antiquity, and even of Mexicans who were politically opposed to him.[7-*] The attention of scholars and students of American Antiquities is particularly turned to Central America, because in that country ruins of a former civilization, and phonetic and figurative inscriptions, still exist and await an interpretation. In Central America are to be found a great variety of ruins of a higher order of architecture than any existing in America north of the Equator. Humboldt speaks of these remains in the following language: “The architectural remains found in the peninsula of Yucatan testify more than those of Palenque to an astonishing degree of civilization. They are situated between Valladolid Mérida and Campeachy.”[7-†] Prescott says of this region, “If the remains on the Mexican soil are so scanty, they multiply as we descend the southeastern slope of the Cordilleras, traverse the rich valleys of Oaxaca, and penetrate the forests of Chiapas and Yucatan. In the midst of these lonely regions, we meet with the ruins recently discovered of several eastern cities--Mitla, Palenque, and Itzalana or Uxmal,--which argue a higher civilization than anything yet found on the American Continent.”[8-*]