To Ernst Dieffenbach   6 April [1846]1

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[On the geological work of Tschudi and Buch.] ‘… My health keeps indifferent & I do not suppose I shall ever be a strong man again: everything fatigues me, & I can work but little at my writing: this summer, however, I shall get out my geology of S America …

I found Bronns Geschichte,2 which you recommended me, very useful, for references to facts on variation …’

Date taken from the Stargardt catalogue.
Bronn 1841–9.

Please cite as “DCP-LETT-972,” in Ɛpsilon: The Charles Darwin Collection accessed on 5 June 2025, https://epsilon.ac.uk/view/dcp-data/letters/DCP-LETT-972