Lecture I

The sins committed by modern physiology in this sphere are well-nigh incredible, when one considers that such a process as tasting is placed in a similar relationship to the soul as that of seeing or hearing. And there are philosophical treatises which speak in a purely general way of sensible qualities and their relation to the soul. Locke, and even Kant, speak generally of a relationship of the outer sense-world to human subjectivity, whereas for all that is shown in our diagram from the sense of sight upwards, we have to do with something quite different from all that the diagram shows from the sense of sight downwards. It is impossible to apply one single doctrine to both these spheres. And it is because men have done so that, from the time of Hume or Locke or even earlier, this great confusion has arisen in the theory of knowledge which has rendered modern conceptions barren right into the sphere of physiology. For one cannot approach the real nature of processes if one thus pursues preconceived ideas without an unprejudiced observation of things.