From John Murray 7 May 1861
My Dear Sir
I enclose my amended note of hand for £372 for the 3rd edition of your work on Species1
This, as far as I can judge, is the amount of d profit arising from 2000 copies.2 There are always contingencies arising—such as advertising expences, which make it difficult to fix beforehand the precise profits on any work.3 Thus in the first Edition—the sum I gave you turned out far more than d or at least my share eventually fell below considerably.4
Moreover it must be borne in mind that it is not a mere rule of 3 sum to calculate profits of a book— Thus—the 3rd. Edn. of 2000 Copies cost only £70. less than 3000 of the 3rd. edition. Moreover this last is increased by two sheets beyond the second edition 23 shts instead of 21.
I enter into these details to prevent any misunderstanding and hope I have been successful.
If we print any more editions I would prefer deferring the settlement untill the whole is disposed of when I could arrange the amount of ds. profit to the uttermost farthing.5
I remain | Dear Sir | Yrs. Very faithfully | (signed) John Murray
C. Darwin Esq
Encloses amended note of £372 for third edition of Origin. Provides details of the calculation of profits.
Please cite as
Darwin Correspondence Project, “Letter no. 3141A,” accessed on 1 May 2016, http://www.darwinproject.ac.uk/DCP-LETT-3141A