So it is purely by experience that we can infer the existence of one object from that of another. The experience goes like this. We remember having had frequent instances of the existence of one sort of object, and also remember that individuals of another sort have always gone along with them, regularly occurring just after them and very close by. Thus we remember seeing the sort of object we call ‘flame’ and feeling the sort of sensation that we call ‘heat’. We recall also their constant conjunction in all past instances—·always flame-then-heat·. Without more ado we call the one ‘cause’ and the other ‘effect’, and infer the existence of the heat from that of the flame. In all the instances from which we •learn the conjunction of particular causes and effects, both the causes and effects have been perceived by the senses and are remembered; but whenever we •reason about them, only one is perceived or remembered, and the other is supplied on the basis of our past experience.

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