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great

degree my

theory;

but none

of the

cases of

difficulty,

to the

best of my

judgment,

annihilate

it. On the

other

hand, the

fact that

instincts

are not

always

absolutely

perfect

and are

liable to

mistakes;—that

no

instinct

has been

produced

for the

exclusive

good of

other

animals,

but that

each

animal

takes

advantage

of the

instincts

of

others;—that

the canon

in natural

history,

of “natura

non facit

saltum” is

applicable

to

instincts