Dear Sir
I am extremely sorry that you have had so much trouble in writing to me at such length. The intended publication seems highly promising & valuable & I am sure I wish it all success.2 But the state of my health conjoined with the quantity of matter which I wish to publish renders it impossible that I shd be a contributor; and this answer I have been compelled unwillingly to make on previous occasions.
I should be proud to be a fellow labourer, but as there is no chance of my writing in the intended Periodical, I do not think it wd be right that my name shd appear.
I beg leave to repeat my regret for the trouble which I have inadvertently caused you, & with my best wishes for the success of your undertaking, I remain | Dear Sir | Yours very faithfully | Charles Darwin
Please cite as “DCP-LETT-13878,” in Ɛpsilon: The Charles Darwin Collection accessed on