The Descent of Man

undergo a double moult, keep their ornamental
feathers for about six months. The male, however,
of the wild Gallus bankiva retains his neckhackles
for nine or ten months; and when these
are cast off, the underlying black feathers on
the neck are fully exposed to view. But with the
domesticated descendant of this species, the
neck-hackles of the male are immediately replaced
by new ones; so that we here see, as to
part of the plumage, a double moult changed
under domestication into a single moult. (82.
For the foregoing statements in regard to partial
moults, and on old males retaining their
nuptial plumage, see Jerdon, on bustards and
plovers, in 'Birds of India,' vol. iii. pp. 617, 637,
709, 711. Also Blyth in 'Land and Water,' 1867,
p. 84. On the moulting of Paradisea, see an interesting
article by Dr. W. Marshall, 'Archives
Neerlandaises,' tom. vi. 1871. On the Vidua,
'Ibis,' vol. iii. 1861, p. 133. On the Drongo- shrikes,
Jerdon, ibid. vol. i. p. 435. On the vernal
moult of the Herodias bubulcus, Mr. S.S. Allen,