This refers to the letter to Murchison (Letter 65), published with the evidence of the 1858 enquiry by the Trustees of the British Museum.) I am made to give my opinion so authoritatively on botanical matters!...
As for our belief in the origin of species making any difference in descriptive work, I am sure it is incorrect, for I did all my barnacle work under this point of view.

Only I often groaned that I was not allowed simply to decide whether a difference was sufficient to deserve a name.
I am glad to hear about Huxley--a wonderful man.
LETTER 345.

TO J.D.HOOKER.

Wells Terrace, Ilkley, Otley, Yorkshire, Thursday [before December 9th, 1859].
I have read your discussion (345/1.

See "Introductory Essay," page c.