Dallas' index [for Variation] well done but rather too full.
A hybrid from an ass and a bull is utterly incredible.
Down. | Bromley. | Kent. S.E.
My dear Sir
Many thanks about the index. I have returned the M.S. with a note to
With respect to the story of a hybrid from an ass and a bull (for I presume you refer to such) it is utterly incredible. Many similar stories have been propagated, but on investigation have proved entirely false.
The explanation has generally been a slight monstrosity.
My dear Sir | yours very sincerely | Ch. Darwin
- f1 5667.f1The year is established by the relationship between this letter and the letter from W. S. Dallas, 4 November 1867.
- f2 5667.f2CD refers to William Sweetland Dallas's specimen of the index for Variation (see letter from John Murray, 1 November ). Neither the enclosure nor CD's note to Dallas has been found.
- f3 5667.f3See letter from John Murray, 1 November  and n. 4.