Visits London and Paris; describes Parisian architecture, museums, galleries and boulevards; the layout and operation of the Jardin des Plantes including sketches of mineral cabinets and cases in its museum; studied insects at the British Museum to identify his collection of American Coleoptera; desires to study one family thoroughly with regard to the theory of the origin of species; Ray Society; Oken's Elements of Physiophilosophy and variety, distribution and arrangement of species.