To Henry Denny 28 January 1
Down. | Bromley. | Kent. S.E.
I thank you very sincerely for your interesting note & answers to my queries.2 I am also much obliged for Mr Murray’s paper;3 (returned by this Post) but the interest of this paper to my mind is much enhanced or rather almost wholly depends on a sentence in your note, viz. “Yet the same species of Lice infest the different varieties of Fowl, pigeon & dog.” Now as I understand this, you have never observed distinct varieties of the same species of Pediculus on different domestic varieties.— If, as is probable, I allude to this subject, I shd. like to quote on your authority this statement.4 But then (though I am ashamed to give so much trouble) I shd be glad to know whether you have often looked to the vars. of our domestic mammals & birds. It is not probable, but if you have ever received pediculi from the domesticated animals inhabiting distant lands, or recently brought from such lands & have found them the same, this wd. add immensely to the value of the statement, I presume you have not attended to the domestic vars. of other animals, besides Fowls, Pigeons & Dogs.5 I fear that you will think me very troublesome; pray excuse me & believe me—
Yours very faithfully | Ch. Darwin
Returns [Andrew] Murray’s paper;
especially values HD’s note that the same species of lice infect the different varieties of fowl, pigeon, and dog. Further queries about the relationship of the same species of pediculi to different domestic varieties.