The Descent of Man

mature. (1. In regard to thrushes, shrikes, and
woodpeckers, see Mr. Blyth, in Charlesworth's
'Mag. of Nat. Hist.' vol. i. 1837, p. 304; also
footnote to his translation of Cuvier's 'Regne
Animal,' p. 159. I give the case of Loxia on Mr.
Blyth's information. On thrushes, see also Audubon,
'Ornith. Biog.' vol. ii. p. 195. On Chrysococcyx
and Chalcophaps, Blyth, as quoted in
Jerdon's 'Birds of India,' vol. iii. p. 485. On Sarkidiornis,
Blyth, in 'Ibis,' 1867, p. 175.) Similar
facts will hereafter be given in regard to certain
herons. Young black-grouse (Tetrao tetrix) resemble
the young as well as the old of certain
other species, for instance the red-grouse or T.
scoticus. Finally, as Mr. Blyth, who has attended
closely to this subject, has well remarked,
the natural affinities of many species are best
exhibited in their immature plumage; and as
the true affinities of all organic beings depend
on their descent from a common progenitor,
this remark strongly confirms the belief that the