1 84 
SEXUAL selection: bieds. 
Part Jl ‘ 
are marked with feeble stripes or rows of spots, and l1 
many allied species both young and old are simh ftr ^ 
marked, no naturalist, who believes in the grad© 1 
evolution of species, will doubt that the progenitor 0 
the lion and puma was a striped animal, the ytd 
having retained vestiges of the stripes, like the kitteb* 
of black cats, which when grown up are not in the l® aS 
striped. Many species of deer, which when mature a 11 
not spotted, are whilst young covered with white sp o(A 
as are likewise some few species in their adult st»^' 
So again the young in the whole family of pigs (Said 
and in certain rather distantly-allied animals, such 
the tapir, are marked with dark longitudinal strips ' 
but here we have a character apparently derived fro' 1 ' 
an extinct progenitor, and now preserved by the ycd 
alone. In all such cases the old have had their cold 
changed in the course of time, whilst the young h !lV 'j 
remained but little altered, and this has been efhd 
through the principle of inheritance at correspond 
ages. 
Tliis same principle applies to many birds belong 1 ®- 
to various groups, in which the young closely resetf^ 
each other, and differ much from their respective ad' 1 
parents. The young of almost all the G allinace©, 0p 
of some distantly-allied birds such as ostriches, 111 ^ 
whilst covered with down longitudinally striped ; ^ 
this character points back to a state of things so * e . 
mote that it hardly concerns us. Young cross-!' 1 
(Loxia) have at first straight beaks like those of 
finches, and iu their immature striated plumage 1111 j| 
resemble the mature redpole aud female siskin, as " e ^ 
as the young of the goldfinch, greenfinch, and so"^, 
other allied species. The young of many kinds ® 
buntings (Emberiza) resemble each other, and d 
wise the adult state of the common bunting, E- d 
