Many naturalists and engineers now travelled or settled in South America. Soon indeed, that is in 1817-1820, the Austrian and Bavarian Governments sent out a scientific expedition, to the command of which they appointed Doctors Spix and Martins, who collected a great deal of information on the botany, ethnography, and geography of these hitherto little known districts--Martins publishing, at the expense of the Austrian and Bavarian governments, a most important work on the flora of the country, which may be looked upon as a model of its kind. At the same time the editors of special publications, such as Malte Brun's _Annales des Voyages_ and the _Bulletin de la Societe de Geographie_, cordially accepted and published all the communications addressed to them, including many on Brazil and the province of Minas Geraes. About this period too a Prussian Major-General, the Prince of Wied-Neuwied, who had been at leisure since the peace of 1815, devoted himself to the study of natural science, geography, and history, undertaking moreover, in company with the naturalists Freirciss and Sellow, an exploring expedition in the interior of Brazil, having special reference to its flora and fauna. A few years later, i.e. in 1836, the French naturalist Alcide d'Orbigny, who had won celebrity at a very early age, was appointed by the governing body of the Museum to the command of an expedition to South America, the special object of which was the study of the natural history of the country. For eight consecutive years D'Orbigny wandered about Brazil, Uruguay, the Argentine Republic, Patagonia, Chili, Bolivia, and Peru. "Such a journey," says Dumour in his funeral oration on D'Orbigny, "in countries so different in their productions, climate, the character of their soil, and the manners and customs of their inhabitants, was necessarily full of ever fresh perils. D'Orbigny, endowed with a strong constitution and untiring energy, overcame obstacles which would have daunted most travellers. On his arrival in the cold regions of Patagonia, amongst savage races constantly at war with each other, he found himself compelled to take part, and to fight in the ranks of a tribe which had received him hospitably. Fortunately for the intrepid student his side was victorious, and he was left free to proceed on his journey."