197. Such a method meets at the outset with the difficulty that the impressions of sensation and those of reflection, if Locke’s determination of the former by reference to an impressive matter is excluded, are each determined only by reference to the other. What is an impression of reflection? It is one that can only come after an impression of sensation. What is an impression of sensation? It is one that comes before any impression of reflection. An apparent determination, indeed, is gained by speaking of the original impressions as ‘conveyed to us by our senses;’ but this really means determination by reference to the organs of our body as affected by outward bodies--in short, by a physical theory. But of the two essential terms of this theory, ‘our own body,’ and ‘outward body,’ neither, according to Hume, expresses anything present to the original consciousness. ‘Properly speaking, it is not our body we perceive when we regard our limbs and members, but certain impressions which enter by the senses.’ Nor do any of our impressions ‘inform us of distance and outness (so to speak) immediately, and without a certain reasoning and experience’. [1] In such admissions Hume is as much a Berkeleian as Berkeley himself, and they effectually exclude any reference to body from those original impressions, by reference to which all other modes of consciousness are to be explained. [1] p. 481 [Book I, part IV., sec. II.] Locke’s theory of sensation disappears. Physiology won’t answer the question that Locke asked.