Note 18 — Chapter XV · ON CROSSING.

Extract of a letter from Sir R. Heron, 1838, given me by Mr. Yarrell. With respect to mice, see ‘Annal. des Sc. Nat.,’ tom. i. p. 180; and I have heard of other similar cases. For turtle-doves Boitard and Corbié, ‘Les Pigeons,’ etc., p. 238. For the Game fowl, ‘The Poultry Book,’ 1866, p. 128. For crosses of tailless fowls see Bechstein, ‘Naturges. Deutsch.’ b. iii. s. 403. Bronn, ‘Geschichte der Natur,’ b. ii. s. 170, gives analogous facts with horses. On the hairless condition of crossed South American dogs, see Rengger, ‘Säugethiere von Paraguay,’ s. 152; but I saw in the Zoological Gardens mongrels, from a similar cross, which were hairless, quite hairy, or hairy in patches, that is, piebald with hair. For crosses of Dorking and other fowls, see ‘Poultry Chronicle,’ vol. ii. p. 355. About the crossed pigs, extract of letter from Sir R. Heron to Mr. Yarrell. For other cases, see P. Lucas ‘L’Héréd. Nat.’ tom. i. p. 212.