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Updated: June 1, 2025


It would be a noble work, but one requiring years of labour, as of course you would wish to incorporate all existing materials and would have to spend months in Berlin and Milan and Paris to study the collections of Spix, Natterer, Oscolati, Castituan and others, as well as most of the chief private collections of Europe. I hope you may undertake it and bring it to a glorious conclusion.

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.

Unknown to his parents, for whom he hoped to prepare a delightful surprise, Agassiz had actually been engaged for months on the first work which gave him distinction in the scientific world; namely, a description of the Brazilian fishes brought home by Martius and Spix from their celebrated journey in Brazil. This was the secret to which allusion is made in the next letter.

I have not, however, been able to give them all the care I could have wished, for M. de Martius, anxious to complete the publication of these works, has urged upon me a rapid execution. I hope, nevertheless, that I have made no gross errors, and I am the less likely to have done so, because I had as my guide the observations you had kindly made for him on the plates of Spix.

Dinkel at work upon the plates for the Fresh-Water Fishes, but Mr. J.C. Weber, who was then engaged in making, under Agassiz's direction, the illustrations for the Spix Fishes, was also giving his spare hours to the same objects. Mr. Dinkel after the death of Agassiz and sent to me.

. . .Most gladly shall I meet your wishes both with regard to the fresh-water fishes of Central Europe and to your desire for the means of direct comparison between the fishes brought by Spix from Brazil and described by you, and those you have recently yourself collected in the Amazons.

The place is classic ground to the Naturalist from having been a favourite spot with the celebrated travellers Spix and Martius, during their stay at Barra in 1820. Von Martins was so much impressed by its magical beauty that he commemorated the visit by making a sketch of the scenery serve as background in one of the plates of his great work on the palms.

"Did you hear the horrid shriek last night? It must have disturbed every one. I think it must have been one of the South American birds which Captain Tropic gave the Marchioness. Do not they sometimes favour the world with these nocturnal shriekings? Is not there a passage in Spix apropos to this? "Did you hear the shriek last night, Mr.

Martius recognized the genius of Agassiz, and offered him, and indeed pressed him, to undertake their elaboration. Agassiz brought out the first part of the quarto volume on the "Fishes of the Brazilian Expedition of Spix and Martius" before he took his degree of doctor of philosophy, and completed it before he proceeded to that of doctor in medicine, in 1830.

Further investigations showed that this would be particularly advantageous, as the district had only been explored by the German zoologist, von Spix, and the botanist von Martins, in 1817-20, and subsequently by Count de Castelnau.

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