objects affect the skin, or the way etheric vibrations affect the rods and cones of the eye so that through the optic nerve and the brain certain impressions are conveyed and aroused, in correspondence with which we have perceptions of colour. Psychology steps in at this point and endeavours to tell what portions of our experience of heat or colour pertain to the things outside, what to the mechanism of the body, and what elements are mental. Furthermore, psychology goes back as far as possible, tracing the causes and conditions which make it possible for us to perceive heat and colour. We do not of course experience a psychological state, no one ever felt a "psychological moment"; what we feel is the perception and the reaction which a stimulus evokes, that is, the psychical moment.

In popular speech we sometimes refer to a person as a psychic or " sensitive," meaning one who has visions, sees spirits, or otherwise apprehends occult phenomena. Such references imply a survival of the former notion that there are special faculties through which unusual experiences are conveyed. They also involve an attempt to reckon with abnormal experiences before we have thought clearly about the normal. In contrast with this view I am pointing out that every possible mental event as actually perceived is psychical, hence that every one is psychical and sensitive. To be sensitive