To John William Parker1 5 May 
Down Farnborough Kent
May 5t h.
As an author of some Scientific works, I beg to express strongly my opinion, that, both for the advantage of Authors & the public, Booksellers like other dealers ought to settle, each for himself, the Retail price.2
Sir | Your obedt. sert. | Charles Darwin
As an author of some scientific works CD is of the opinion that each bookseller should settle, each for himself, the retail price.