In general, knowledge increases like a rolling snowball; a
certain amount forms a base for extra improvement, and upon
successive foundations of increasing altitude the eminence has
been attained of the present era. This is the effect of
"reason;" but "instinct," although beautiful in its original
construction, remains, like the blossom of a tree, ever the same
- a limited effect produced by a given cause; an unchangeable law
of Nature that certain living beings shall perform certain
functions which require a certain amount of intelligence; this
amount is supplied by Nature for the performance of the duties
required; this is instinct.
Thus, according to the requirements necessitated by the habits of
certain living creatures to an equivalent amount is their share
of instinct. Reason differs from instinct as combining the
effects of thought and reflection; this being a proof of
consideration, while instinct is simply a direct emanation from
the brain, confined to an impulse.
In our observations of Nature, especially in tropical countries,
we see numberless exemplifications of these powers, in some of
which the efforts of common instinct halt upon the extreme
boundary and have almost a tinge of reason.
What can be more curious than the nest of the tailor-bird - a
selection of tough leaves neatly sewn one over the other to form
a waterproof exterior to the comfortable little dwelling within?
Where does the needle and thread come from?
