26. Secondary qualities twofold; first, immediately perceivable; secondly, mediately perceivable.
To conclude.
Besides 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 capable of producing ideas in us different from what before
they did. The former of these, I think, may be called secondary qualities immediately perceivable: the latter,
secondary qualities, mediately perceivable.
