In the jaundice
every one knows that all things seem yellow. Is it not therefore
highly probable those animals in whose eyes we discern a very
different texture from that of ours, and whose bodies abound with
different humours, do not see the same colours in every object
that we do? From all which, should it not seem to follow that all
colours are equally apparent, and that none of those which we
perceive are really inherent in any outward object?
. It should.
. The point will be past all doubt, if you consider
that, in case colours were real properties or affections inherent
in external bodies, they could admit of no alteration without
some change wrought in the very bodies themselves: but, is it not
evident from what hath been said that, upon the use of
microscopes, upon a change happening in the burnouts of the eye,
or a variation of distance, without any manner of real alteration
{186} in the thing itself, the colours of any object are either
changed, or totally disappear? Nay, all other circumstances
remaining the same, change but the situation of some objects, and
they shall present different colours to the eye.
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