This is so notable and so natural an illusion, that it may be proper to consider the principles, from which it is derived.
Though an extended object be incapable of a conjunction in place with another, that exists without any place or extension, yet are they susceptible of many other relations.

Thus the taste and smell of any fruit are inseparable from its other qualities of colour and tangibility; and whichever of them be the cause or effect, it is certain they are always co-existent.

Nor are they only co-existent in general, but also co-temporary in their appearance in the mind; and it is upon the application of the extended body to our senses we perceive its particular taste and smell.

These relations, then, of causation, and contiguity in the time of their appearance, betwixt the extended object and the quality, which exists without any particular place, must have such an effect on the mind, that upon the appearance of one it will immediately turn its thought to the conception of the other.

Nor is this all.