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“The external objects which, by their mere presence, act upon the
organs of the senses ; and which, by this means, determine the corporal
machine to move in many different ways, according as the parts of the
brain are arranged, are like the strangers who, entering into some of the
grottoes of those water-works, unconsciously cause the movements which
take place in their presence. For they cannot enter without treading upon
certain planks so arranged that, for example, if they approach a bathing
Diana, they cause her to hide among the reeds; and if they attempt to
follow her, they see approaching a Neptune, who threatens them with his
trident; or if they try some other way, they cause some monster who
vomits water into their faces, to dart out; or like contrivanc‘es, according
to the fancy of the engineers who have made them. And lastly, when
the rational soul is lodged in this machine, it will have its principal seat
in the brain, and will take the place of the engineer, who ought to be
in that part of the works with which all the pipes are connected, when
he wishes to increase, or to slacken, or in some way to alter, their move-

“All the functions which I have attributed to this machine” (the
body), “as the digestion of food, the pulsation of the heart and of the
arteries; the nutrition and the growth of the limbs; respiration, wake-
fulness, and sleep; the reception of light, sounds, odors, flavors, heat, and
such like qualities, in the organs of the external senses; the impression
of the ideas of these in the organ of common-sense and in the imagina-
tion; the retention, or the impression, of these ideas on the memory;
the internal movements of the appetites and the passions; and lastly,
the external movements of all the limbs, which follow so aptly, as well
the action of the objects which are presented to the senses, as the im-
pressions which meet in the memory, that they imitate as nearly as
possible those of a real man: Idesire, I say, that you should consider
that these functions in the machine naturally proceed from the mere
arrangement of its organs, neither more nor less than do the movements
of a clock, or other automaton, from that of its weights and its wheels;
so that, so far as these are concerned, it is not necessary to conceive any
other vegetative or sensitive soul, nor any other principle of motion, or
of life, than the blood and the spirits agitated by the fire which burns
continually in the heart, and which is no wise essentially difl‘erent from
all the fires which exist in inanimate bodies.”

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