[207] Spooner, in 'Journal Royal Agricult. Soc.,' vol. xx., part ii.
[208] See Colin's 'Traité de Phys. Comp. des Animaux Domestiques,' tom. ii. p. 536, where this subject is well treated.
[209] 'Les Pigeons,' p. 37.
[210] Vol. i., 1854, p. 101.
[211] 'Cottage Gardener,' 1856, p. 110.
[212] 'Bastarderzeugung,' s. 553.
[213] Dr. Pigeaux, in 'Bull. Soc. d'Acclimat.,' tom. iii., July 1866, as quoted in 'Annals and Mag. of Nat. Hist.,' 1867, vol. xx. p. 75.
[214] 'Journal de Physiolog.,' tom. ii., 1859, p. 385.
[215] Dec. 1863, p. 484.
[216] On the Varieties of Wheat, p. 66.