'»Af 
'• XVI. 
INHERITANCE, LIMITED BY AGE. 
385 
tlj e * a ™ost the whole large group of thrushes 
'V'lii |' r ° Ull » ' iave Lieir breasts spotted — a character 
ls retained by many species throughout life, 
to,,.- ls I'd to lost by others, as by the Tardus migra- 
the 
0^ 18 a 
’ lils - So again with many thrushes, the feathers on 
ac L are mottled before they are moulted for the 
^rt, ■' lll ' e ’ au d this character is retained for life by 
fji. 111 eastern species. The young of many species of 
U'Ufr-- - • - - -- 
pj es (Lanins), of some woodpeckers, and of an Indian 
6r f ( Chalcophaps Indicus), are transversely striped 
10 under surface ; and certain allied species or 
Ag*. 
c;! f ! ' a when adult are similarly marked. In some 
Co,. ' y' a Uied and resplendent Indian cuckoos (Cliry, so- 
ft. 0i ^ x )> the species when mature differ considerably 
tin,, other in colour, but the young cannot be dis- 
D^'tshed. The young of an Indian goose ( Sarkidiornk 
,n °notus) closely resemble in plumage an allied 
1, s > I)endrocygna, when mature. 1 Similar facts will 
l*Wh tSr ^’ ven * n regard to certain herons. Young 
grouse (Tetrad tdrix) resemble the young as well 
j> fCj 10 °ld of certain other species, for instance the red 
° r sc °ticus. Finally, as Mr. Llyth, who lias 
w Dl] ed closely to this subject, has well remarked, the 
t^i . affinities of many species are best exhibited in 
a.(] "Umature plumage ; aud as the true affinities of 
Oganic beiugs depend on their descent from a 
^lief 
the former" 
progenitor, this remark strongly confirms the 
that the immature plumage approximately shews 
or ancestral condition of the species. 
L i-i 
Vm ,e 8wd to thrushes, shrikes, and woodpeckers, sec Mr. Blyth, in 
‘tis ^' 0l 'th’s ‘Mag. of Nat. Hist.’ vol. i. 1837, p. 304; also footnote 
i * L.vj ans ktion of Cuvier’s ‘Rtgne Animal,’ p. 159. 1 give the ease 
^hith rv* 1 ^ r> Blythts information. On thrushes, see also Audubon, 
pt’hi,,, 1 ' d^kgraphy,’ vol. ii. p, 195. On Chrysocoecyx and Ohal- 
^0 8#>i- as quoted in Jordon’s ‘Birds of India,’ vol. iii. p. 485. 
‘ kdiornis, Blytli, in ‘Ibis,’ 1867, p. 175. 
