Chapter 3

1828-1829: AGE 21-22.

First Important Work in Natural History.--Spix's Brazilian Fishes. --Second Vacation Trip.--Sketch of Work during University Year. --Extracts from the Journal of Mr. Dinkel.--Home Letters.--Hope of joining Humboldt's Asiatic Expedition.--Diploma of Philosophy. --Completion of First Part of the Spix Fishes.--Letter concerning it from Cuvier.