atural
Selection--that is, the "Survival of the Fittest" in competition with
the rest--there will be constant improvement in the Instinct.

2. The other theory, the rival one, holds that there are some
instincts which show so plainly the marks of Reason that some degree
of intelligent adjustment to the environment must be allowed to the
animal in the acquiring of these functions. For example, we are told
that some of the muscular movements involved in the instincts--such,
for example, as the bird's nest-building--are so complex and so finely
adjusted to an end, that it is straining belief to suppose that they
could have arisen gradually by reflex adaptation alone. There is also
a further difficulty with the reflex theory which has seemed
insurmountable to many of the ablest psychologists of animal life; the
difficulty, namely, that many of the instincts require the action of a
great many muscles at the same time, so acting in "correlation" with
or support of one another that it is impossible to suppose that the
instinct has been acquired gradually. For in the very nature of these
cases we can not suppose the instinct to have ever been imperfect,
seeing that the partial instinct which would have preceded the perfect
performance for some generations would have been not only of no use to
the creature, but in many cases positively injurious. For instance,
what use to an animal to be able partly to make the movements of
swimming, or to the birds to build an inadequate nest? Such instincts
would not be usable at all. So we are told by the second theory that
the animals must have had intelligence to do these things when they
first acquired them. Yet, as is everywhere admitted, after the
instinct has been acquired by the species it is then carried out
without knowledge and intelligent design, being handed down from
generation to generation by heredity.

This seems reasonable, for we do find that actions which were at first
intelligent may be performed so frequently that we come to do them
without thinking of them; to do them from habit. So the animals, we
are told, have come to do theirs reflexly, although at first they
required intelligence. From this point of view--that although
intelligence was at first required, yet the actions have become
instinctive and lacking in intelligent direction in later
generations--this is called the theory of Lapsed Intelligence.

This theory has much to commend it. It certainly meets the obj