Lecture I

Within the range of the senses, the sense of hearing, for example, is of course radically different from the sense of sight or the sense of taste. And having come to a clear conception of the sense of hearing or of the sense of sight, we then have to recognise a word-sense, a sense of thought and an ego-sense. Most of the concepts current to-day in scientific treatises on the senses are actually taken from the sense of touch. And our philosophy has for some time been wont to base a whole theory of knowledge on this, a theory which actually consists of nothing but a transference of certain perceptions proper to the sense of touch to the whole sphere of capacity for sense-perception.