i.)
will regard the external body as actually existing, until it is affected,
&c. Q.E.D.
Corollary.- (17:3) The mind is able to regard as present external bodies,
by which the human body has once been affected, even though they be no
longer in existence or present.
Proof.- (17:4) When external bodies determine the fluid parts of the human
body, so that they often impinge on the softer parts, they change the
surface of the last named ([Po.V] ); hence ([A.viii ] ) they are refracted
therefrom in a different manner from that which they followed before such
change; and, further, when afterwards they impinge on the new surfaces by
their own spontaneous movement, they will be refracted in the same manner,
as though they had been impelled towards those surfaces by external bodies;
consequently, they will, while they continue to be thus refracted, affect
the human body in the same manner, whereof the mind ([xii] ) will again
take cognizance - that is ([xvii] ), the mind will again regard the
external body as present, and will do so, as often as the fluid parts of
the human body impinge on the aforesaid surfaces by their own spontaneous
motion. (17:5) Wherefore, although the external bodies, by which the human
body has once been affected, be no longer in existence, the mind will
nevertheless regard them as present, as often as this action of the body
is repeated.
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