patiently doing his work for many days, contrived to connect this
stop-cock with some of the moving parts of the engine by a wire, in such
a manner that the engine itself did the work which had been intrusted to
him; and after seeing that the whole business would go regularly
forward, he left the wire in charge, and went away to play.

Such is the story. Now if it is true, how much pleasure the boy must
have experienced in devising and witnessing the successful operation of
his scheme. I do not mean the pleasure of relieving himself from a dull
and wearisome duty; I do not mean the pleasure of anticipated play; but
I mean the strong interest he must have taken in _contriving and
executing his plan_. When, wearied out with his dull, monotonous work,
he first noticed those movements of the machinery which he thought
adapted to his purpose, and the plan flashed into his mind, how must his
eye have brightened, and how quick must the weary listlessness of his
employment have vanished. While he was maturing his plan and carrying it
into execution--while adjusting his wires, fitting them to the exact
length and to the exact position--and especially when, at last, he began
to watch the first successful operation of his contrivance, he must have
enjoyed a pleasure which very few even of the joyous sports of childhood
could have supplied.

It is not, however, exactly the pleasure of exercising _ingenuity in
contrivance_ that I refer to here; for the teacher has not, after all, a
great deal of absolute _contriving_ to do, or, rather, his _principal
business_ is not contriving. The greatest and most permanent source of
pleasure to the boy, in such a case as I have described, is his feeling
that he is accomplishing a great effect by a slight effort of his own;
the feeling of _power_; acting through the _intervention of
instrumentality_, so as to multiply his power. So great would be this