[180] ‘Introduct. to the Trochilidæ,’ p. 102.
[181] Gould, ‘Handbook of Birds of Australia,’ vol. ii. p. 32 and 68.
[182] Audubon, ‘Ornitholog. Biography,’ 1838, vol. iv. p. 389.
[183] Jerdon, ‘Birds of India,’ vol. i. p. 108; and Mr. Blyth, in ‘Land and Water,’ 1868, p. 381.
[184] Graba, ‘Tagebuch, Reise nach Färo,’ 1830, s. 51-54. Macgillivray, 'Hist. British Birds,’ vol. iii. p. 745. ‘Ibis,’ vol. v. 1863, p. 469.
[185] Graba, ibid. s. 54. Macgillivray, ibid. vol. v. p. 327.
[186] ‘Variation of Animals and Plants under Domestication,’ vol. ii. p. 92.
[187] On these points see also ‘Variation of Animals and Plants under Domestication,’ vol. i. p. 253; vol. ii. p. 73, 75.
[188] See, for instance, on the irides of a Podica and Gallicrex in ‘Ibis,’ vol. ii. 1860, p. 206; and vol. v. 1863, p. 426.
[189] See also Jerdon, ‘Birds of India,’ vol. i. p. 243-245.