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The members of every collection possess some quality
common to them and possessed by nothing else in the
universe; and for that reason it is for some purposes
much the same thing to say that an object belongs to
a collection and to say that it possesses a quality. But
for other purposes the distinction is important. Qualities
possess no individual identity but only similarity
while a collection is a single individual collection, though
possessing it is true only a derived individuality.

A quality possesses, in itself, few positive
qualities, which few are mostly of the particular
kind called quantities. Thus, any particular kind
of red, has its degree of light, its degree of fullness
of color, and its peculiar quality of hue. This
third is something more than a mere quantity.