production, and with which they have not any apparent congruity or
conceivable connexion. Hence it is that we are so forward as to imagine,
that those ideas are the resemblances of something really existing
in the objects themselves since sensation discovers nothing of bulk,
figure, or motion of parts in their production; nor can reason show how
bodies BY THEIR BULK, FIGURE, AND MOTION, should produce in the mind the
ideas of blue or yellow, &c. But, in the other case in the operations of
bodies changing the qualities one of another, we plainly discover that
the quality produced hath commonly no resemblance with anything in the
thing producing it; wherefore we look on it as a bare effect of power.
For, through receiving the idea of heat or light from the sun, we are
apt to think IT is a perception and resemblance of such a quality in the
sun; yet when we see wax, or a fair face, receive change of colour from
the sun, we cannot imagine THAT to be the reception or resemblance of
anything in the sun, because we find not those different colours in
the sun itself. For, our senses being able to observe a likeness or
unlikeness of sensible qualities in two different external objects, we
forwardly enough conclude the production of any sensible quality in any
subject to be an effect of bare power, and not the communication of any
quality which was really in the efficient, when we find no such sensible
quality in the thing that produced it. But our senses, not being able to
discover any unlikeness between the idea produced in us, and the quality
of the object producing it, we are apt to imagine that our ideas are
resemblances of something in the objects, and not the effects of certain
powers placed in the modification of their primary qualities, with which
primary qualities the ideas produced in us have no resemblance.

26. Secondary Qualities twofold; first, immediately perceivable;
secondly, mediately perceivable.

To conclude. Beside those before-mentioned primary qualities in bodies,
viz. bulk, figure, extension, number, and motion of their solid parts;
all the rest, whereby we take notice of bodies, and distinguish them one
from another, are nothing else but several powers in them, depending on
those primary qualities; whereby they are fitted, either by immediately
operating on our bodies to produce several different ideas in us; or
else, by operating on other bodies, so to change their primary qualities
as to render them