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Darwin Correspondence Project

From George Thin to Alexander Michie1   19 March 1871

East Linton

March 19th. 1871

My dear Alex

The facts about my uncle’s2 bitch are these.

More than twenty years ago he had a bull-terrier bitch. A Captain Arkwright resided here at that time and had a famous Irish bull dog, Jim.3 He got a litter of pups off Jim twice. He then wished to have a litter off a very fine rough Scotch terrier. As soon as his bitch began to show signs of being in heat he shut her up and is quite certain that no dog but the Scotch terrier got near her. The bitch had always shown a decided preference for Jim, so much so that even when in heat she would snarl at other dogs that came near her. She was put under lock with the Scotch terrier, and in due time she had her pups. None of them resembled the Scotch terrier but they were all like the bull dog. One was so like that he kept him on that account and he (the pup) was in the village for several years afterwards. The likeness was both in shape & colour.

My uncle has been long a breeder and fancier of dogs, and has always had the conviction that some cause other than copulation produced this remarkable phenomenon.

I am yours | G Thin

CD annotations

Top of letter: ‘(Previous impregnation)’4pencil; square brackets in MS

Footnotes

A note in Robert Swinhoe’s hand at the bottom of the last page of this letter reads, ‘Surgeon practising at Shanghai writing to his brother— I know both well. RS’. Swinhoe evidently passed on the letter to CD. Swinhoe was on leave in England (see letter from Robert Swinhoe, 14 March 1871).
The uncle of Alexander Michie and George Thin was Alexander Beaton Laing.
Captain Arkwright has not been further identified.
CD discussed the effects of previous impregnation on subsequent progeny in Variation 1: 402–5. He discussed further cases in his letter to J. J. Weir 17 March [1870] (Correspondence vol. 18).

Bibliography

Correspondence: The correspondence of Charles Darwin. Edited by Frederick Burkhardt et al. 29 vols to date. Cambridge: Cambridge University Press. 1985–.

Variation: The variation of animals and plants under domestication. By Charles Darwin. 2 vols. London: John Murray. 1868.

Summary

Bitch crossed with dog produced puppies like those of previous cross with a very different dog.

[Forwarded to CD by Robert Swinhoe.]

Letter details

Letter no.
DCP-LETT-7602
From
George Thin
To
Alexander Michie
Sent from
East Linton
Source of text
DAR 178: 90
Physical description
LS 4pp † (by CD)

Please cite as

Darwin Correspondence Project, “Letter no. 7602,” accessed on 5 June 2025, https://www.darwinproject.ac.uk/letter/?docId=letters/DCP-LETT-7602.xml

Also published in The Correspondence of Charles Darwin, vol. 19

letter