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34 MAEGABET F. WASHBUBN : SUBJECTIVE COLOURS. fact that a monotonous sound suddenly becomes louder that constitutes the fact of its being attended to ; it is the sudden stirring up of associated ideas of its cause and significance, the ' what's that ? ' not the increase of in- tensity due to the external stimulus, but that due to the influx of excitation from associated brain centres. Such, at any rate, is the view of attention suggested, rather than proved, by the experiments described above. The writer hopes that as an hypothesis it is at least worth considering, if only to be rejected upon other evidence.
