and distinct impulse, and when this impelling energy leaves, the
form becomes inert. The steam engine rotates under the impetus of an
invisible gas called steam. Before steam filled its cylinder, the engine
stood still, and when the impelling force is shut off its motion again
ceases. The dynamo rotates under the still more subtile influence of an
electric current which may also cause the click of a telegraph instrument
or the ring of an electric bell, but the dynamo ceases its swift whirl and
the persistent ring of the electric bell becomes mute when the invisible
electricity is switched off. The form of the bird, the animal and the
human being also cease their motion when the inner force which we call
_life_ has winged its invisible way.

All forms are impelled into motion by desire:--the bird and the animal roam
land and air in their desire to secure food and shelter, or for the
purpose of breeding, man is also moved by these desires, but has in
addition other and higher incentives to spur him to effort, among them is
desire for rapidity of motion which led him to construct the steam engine
and other devices that move in obedience to _his_ desire.

If there were no iron in the mountains man could not build machines. If
there were no clay in the soil, the bony structure of the skeleton would
be an impossibility, and if there were no Physical World at all, with its
solids, liquids and gases, this dense body of ours could never have come
into existence. Reasoning along similar lines it must be at once apparent
that if there were no Desire World composed of desire-stuff, we should
have no way of forming feelings, emotions and desires. A planet composed
of the materials we perceive with our _physical_ eyes and of no other
substances, might be the home of plants which grow unconsciously, but have
no desires to cause them to move. The human and animal kingdoms however,
would be impossibilities.

Furthermore, there is in the world a vast number of things, from the
simplest and most crude instruments, to the most intricate and cunning
devices which have been constructed by the hand of man. These reveal the
fact of man's thought and ingenuity. Thought must have a source as well as
_form_ and _feeling_. We saw that it was necessary to have the requisite
material in order to build a steam engine or a body and we reasoned from
the fact that in order to obtain material to express _desire_ there must
also be a world composed of de