Dear Sir
I thank you sincerely for the renewed proof of your kindness in sending me your Problèmes de la Nature”.2 I have not yet read any part for I see that it will require much attention; but I hope soon to read it & I am sure that it will give me much pleasure. I have had a very long & bad illness & am still very far from strong & am afraid to exercise my mind much.3 I fear I shall never again have much strength but hope still to do a little more work in Natural History—
With sincere respect & with my best thanks, I remain | Dear Sir | Yours truly obliged | Charles Darwin
Please cite as “DCP-LETT-4607F,” in Ɛpsilon: The Charles Darwin Collection accessed on