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retaining

nearly the

same

instincts.

For

instance,

we can

understand

on the

principle

of

inheritance,

how it is

that the

thrush of

South

America

lines its

nest with

mud, in

the same

peculiar

manner as

does our

British

thrush:

how it is

that the

male wrens

(Troglodytes)

of North

America,

build

“cock-nests,”

to roost

in, like

the males

of our

distinct

Kitty-

wrens,—a

habit

wholly

unlike

that of

any other

known

bird.

Finally,

it may not