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as well as

to

corporeal

structure,

and is

plainly

explicable

on the

foregoing

views, but

is

otherwise

inexplicable,—all

tend to

corroborate

the theory

of natural

selection.

This

theory is,

also,

strengthened

by some

few other

facts in

regard to

in-

stincts;

as by that

common

case of

closely

allied,

but

certainly

distinct,

species,

when

inhabiting

distant

parts of

the world

and living

under

considerably

dif-

ferent

conditions

of life,

yet often