more really in them than sickness or pain is in manna. Take away the
sensation of them; let not the eyes see light or colours, nor the can
hear sounds; let the palate not taste, nor the nose smell, and all
colours, tastes, odours, and sounds, AS THEY ARE SUCH PARTICULAR IDEAS,
vanish and cease, and are reduced to their causes, i.e. bulk, figure,
and motion of parts.

18. The secondary exist in things only as modes of the primary.

A piece of manna of a sensible bulk is able to produce in us the idea
of a round or square figure; and by being removed from one place to
another, the idea of motion. This idea of motion represents it as it
really is in manna moving: a circle or square are the same, whether in
idea or existence, in the mind or in the manna. And this, both motion
and as figure, are really in the manna, whether we take notice of
primary, them or no: this everybody is ready to agree to. Besides,
manna, by the bulk, figure, texture, and motion of its parts, has a
power to produce the sensations of sickness, and sometimes of acute
pains or gripings in us. That these ideas of sickness and pain are NOT
in the manna, but effects of its operations on us, and are nowhere when
we feel them not; this also every one readily agrees to. And yet men
are hardly to be brought to think that sweetness and whiteness are not
really in manna; which are but the effects of the operations of manna,
by the motion, size, and figure of its particles, on the eyes and
palate: as the pain and sickness caused by manna are confessedly nothing
but the effects of its operations on the stomach and guts, by the size,
motion, and figure of its insensible parts, (for by nothing else can a
body operate, as has been proved): as if it could not operate on the
eyes and palate, and thereby produce in the mind particular distinct
ideas, which in itself it has not, as well as we allow it can operate
on the guts and stomach, and thereby produce distinct ideas, which in
itself it has not. These ideas, being all effects of the operations of
manna on several parts of our bodies, by the size, figure, number, and
motion of its parts;--why those produced by the eyes and palate should
rather be thought to be really in the manna, than those produced by
the stomach and guts; or why the pain and sickness, ideas that are the
effect of manna, should be thought to be nowhere when they are not felt;
and yet the sweetness and whiteness, effects of the same manna on ot