Letter from Charles Darwin to John Murray III, 2 April 1859 [Library reference: MS.42153].
John Murray had agreed generous terms with Charles Darwin to publish 'On the Origin of Species'.
However, Darwin informed Murray by letter in April 1859 that he would understand if Murray wanted to remove his offer after he had read the manuscript.
Darwin outlined the work and proposed chapter headings to Murray in his letter of 31 March 1859.