Note 33 — Chapter XVII · ON THE GOOD EFFECTS OF CROSSING, AND ON THE EVIL EFFECTS OF CLOSE INTERBREEDING.
Reading edition
‘Journal Royal Agricult. Soc.,’ 1846, vol. vii. p. 205; see also Ferguson on the Fowl, pp. 83, 317; see also ‘The Poultry Book,’ by Tegetmeier, 1866, p. 135, with respect to the extent to which cock-fighters found that they could venture to breed in-and-in, viz., occasionally a hen with her own son; “but they were cautious not to repeat the in-and-in breeding.”