another, then with a third, gives all the mechanism of _reasoning_.

An idea, which is only an imperceptible modification of the brain, gives
play to the organ of speech, which displays itself by the motion it
excites in the tongue: this, in its turn, breeds ideas, thoughts, and
passions, in those beings who are provided with organs susceptible of
receiving analagous motion; in consequence of which, the wills of a
great number of men are influenced, who, combining their efforts,
produce a revolution in a state, or even have an influence over the
entire globe. It is thus, that an ALEXANDER decided the fate of Asia, it
is thus, that a MAHOMET changed the face of the earth; it is thus, that
imperceptible causes produce the most terrible, the most extended
effects, by a series of necessary motion imprinted on the brain of man.

The difficulty of comprehending the effects produced on the soul of man,
has made him attribute to it those incomprehensible qualities which have
been examined. By the aid of imagination, by the power of thought, this
soul appears to quit his body, to carry itself with the greatest ease,
to transport itself with the utmost facility towards the most distant
objects; to run over, to approximate in the twinkling of an eye, all the
points of the universe: he has therefore believed, that a being who is
susceptible of such rapid motion, must be of a nature very distinguished
from all others; he has persuaded himself that this soul in reality does
travel, that it actually springs over the immense space necessary to
meet these various objects; he did not perceive, that to do it in an
instant, it had only to run over itself to approximate the ideas
consigned to its keeping, by means of the senses.

Indeed, it is never by any other means than by his senses, that beings
become known to man, or furnish him with ideas; it is only in