original nature goes, the tendency to attend to novel objects, to human
behavior, to explore with the eyes and manipulate with the hands, to
enjoy having sensations of all kinds merely for their own sakes, make up
what is known as the instinct of curiosity. But what a tremendous amount
of modification is necessary before these crude responses result in the
valuable scientific curiosity. Not blind following where instinct leads,
but modification, must be the watchword.

On the other hand, there are equally few tendencies that could be
spared, could be absolutely voted out without loss to the individual or
the race. Bullying as an original tendency seems to add nothing to the
possibilities of development, but every other inborn tendency has its
value. Jealousy, anger, fighting, rivalry, possessiveness, fear, each
has its quota to contribute to valuable manhood and womanhood. Again,
not suppression but a wise control must be the attitude of the educator.
Inhibition of certain phases or elements of some of the tendencies is
necessary for the most valuable development of the individual, but the
entire loss of any save one or two would be disastrous to some form of
adult usefulness or enjoyment. The method by which valuable elements or
phases of an original tendency are fixed and strengthened is the general
method of habit formation and will be taken up under that head in
Chapter IV. When the modification involves definite inhibition, there
are three possible methods,--punishment, disuse, and substitution. As an
example of the use of the three methods take the case of a child who
develops a fear of the dark. In using the first method the child would
be punished every time he exhibited fear of the dark. By using the
second method he would never be allowed to go into a dark room, a light
being left burning in his bedroom, etc., until the tendency to fear the
dark had passed. In the third method the emotion of fear would be
replaced by that of joy or satisfaction by making the bedtime the