Note 33 — Chapter XVI · CAUSES WHICH INTERFERE WITH THE FREE CROSSING OF VARIETIES—INFLUENCE OF DOMESTICATION ON FERTILITY.

For the eggs of Gallus bankiva, see Blyth, in ‘Annals and Mag. of Nat. Hist.,’ 2nd series, vol. i., 1848, p. 456. For wild and tame ducks, Macgillivray, ‘British Birds,’ vol. v. p. 37; and ‘Die Enten,’ s. 87. For wild geese, L. Lloyd, ‘Scandinavian Adventures,’ vol. ii. 1854, p. 413; and for tame geese, ‘Ornamental Poultry,’ by Rev. E. S. Dixon, p. 139. On the breeding of Pigeons, Pistor, ‘Das Ganze der Taubenzucht,’ 1831, s. 46; and Boitard and Corbié ‘Les Pigeons,’ p. 158. With respect to peacocks, according to Temminck (‘Hist. Nat. Gén. des Pigeons,’ etc., 1813, tom. ii. p. 41), the hen lays in India even as many as twenty eggs; but according to Jerdon and another writer (quoted in Tegetmeier’s ‘Poultry Book,’ 1866, pp. 280, 282), she there lays only from four to nine or ten eggs: in England she is said, in the ‘Poultry Book,’ to lay five or six, but another writer says from eight to twelve eggs.