On reflection, in view of the extensive additions CD has made to Origin, has decided to print 1500 copies [of 4th ed.].
My Dear Sir
I have received your obliging note & reflecting upon the large & very important additions wch you have made in this Edition of your work on Species, wch I had observed myself in the proof sheets I propose to print 1500, instead of 1000 copies— Counting on your assent.
You shall have 18 copies of the new Ed
Ch Darwin Esq
- f1 5105.f1The year is established by the relationship between this letter and the letter to John Murray, 28 May .
- f2 5105.f2See letter to John Murray, 28 May . Murray had originally stated that he would print 1000 copies (see letter from John Murray, 25 May  and n. 2).
- f3 5105.f3See Appendix IV for a presentation list for the fourth edition of Origin.