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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 …’
Please cite as “DCP-LETT-972,” in Ɛpsilon: The Charles Darwin Collection accessed on