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Letter 418

Fox, W. D. to Darwin, C. R.

[c. Nov 1838]

    Summary Add

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    Reports on the effects of inbreeding in dogs and the results of crossing Canada and common geese.

Transcription

My dear Darwin

Before I enter into any chitchat, I shall give you the result of my enquiries about Dogs, Geese, &c, which you requested me to see about.—

First about H: Galtons Dogs— I wrote to him & have the following answers. “I have found from breeding in & in that there is considerable difficulty in keeping up the breed. Many of the females have never exhibited any sexual appetite & those which do so at all, very rarely.

The Knot in the tail appeared by accident in one of the finest Dog puppies I had, so fine that I kept it notwithstanding this imperfection & all his descendants had it until at last I got a cross with one of Lord Aylesfords Bloodhounds, since which time it has disappeared. The knot was always in the same part of the tail. Another consequence of breeding in & in is that the animals become prematurely old.”

I give you this in his own words— They agree pretty much with what I told you, do they not?

Now as to the Geese. I went to Mr Strutts & examined them myself & had the old man who always takes care of them to examine. They had at one time a pair of Canada Geese— The Gander however was so shy that he never would perform his Marital Duties, & a Common Gander undertook them for him.— The first year, there were five young produced from this cross—all very much more partaking of the make & plumage of the Canada Goose than the Common Gander. This year from the same pair (viz the Canada & Common Gander) there were 6 eggs produced, but 5 were addled there is now one young one & it is so like the Canada breed, that at first I doubted the mans word, till on getting nearer to it, I saw that the white spot on the neck was not so pure a white—that the plumage was generally duller & that there was a difference in the shape. However to a casual observer 50 yards off, it would pass for a Canada. I should tell you that the Canada Gander has been long dead, so that there can be no mistake as there are only common or Chinese Ganders, she could cross with. The Chinese & common breed he tells me better together, than if not crossed. There is also a 12 bred Goose (between these two) which has now 8 young by a Chinese Gander. This visit proves what I told you that the Chinese [illeg] & Common Geese breed freely together & also that the 12 breed are fertile also.

So much for my enquiries. <rest of page excised >

I hope to hear you are going on as comfortably & industriously as when I last heard from you. When is your Book to come out— I want much to see it?— I am scribbling this in a sad hurry but I am determined to send it off today & I have a Funeral immediately.— Tell me whether <rest of page excised >

    Footnotes Add

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    f1 418.f1
    Dated on the basis of the relationship between this letter and the letter to W. D. Fox, [15 June 1838], and CD's annotation (see n. 8, below).
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    f2 418.f2
    Howard Galton, brother of Samuel Tertius Galton.
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    f3 418.f3
    Heneage Finch, 5th Earl Aylesford.
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    f4 418.f4
    Fox probably discussed this with CD in November 1837 when CD paid him a visit on the Isle of Wight (‘Journal’; Correspondence vol. 2, Appendix II). CD made notes about Howard Galton's bloodhounds in Notebook B: 175–6, 182, and 183, sometime in December 1837 or January 1838, and later used the information on bloodhounds in Variation 2: 121.
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    f5 418.f5
    Probably a relative of Isabella Strutt, wife of Howard Galton.
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    f6 418.f6
    CD had made notes on information provided by Fox on the crossing of geese in Notebook D: 9, 13. He later used the information Fox provided on hybrid geese in his ‘big book’ (see Natural selection, p. 453).
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    f7 418.f7
    Fox is presumably asking for the exact date of publication of Journal and remarks, having been told by CD that it would be published in the autumn of 1838 (see letter to W. D. Fox, [15 June 1838]). Journal and remarks was not published until early 1839.
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    f8 418.f8
    Presumably a reference to Owen 1838b, read 7 November 1838.
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    f9 418.f9
    A reference to one of the fossils collected by Fox on the Isle of Wight. See letter to W. D. Fox, [11 December 1837].
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