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96 At this moment "element" and "character" are absolutely indistinguishable (they are always inseparable as Petzoldt ingeniously pointed out), so improving the original statement of Avenarius.

In a dense crowd I perceive, for instance, a face which attracts me across the swaying mass by its expression. I have no idea what the face is like, and should be quite unable to describe it or give an idea of it; but it has appealed to me in the most disturbing manner, and I find myself asking with keen curiosity, "Where have I seen that face before?"

A man may see the head of a woman for a moment, and this may make a very strong impression on him, and yet he may be unable to say exactly what he has seen, or, for instance, be able to remember the colour of her hair. The retina must be exposed to the object sufficiently long, if only a fraction of a second, for a photographic impression to be made.

If one looks at any object from a considerable distance one has at first only the vaguest impression of its outlines; and as one comes nearer and sees the details more clearly, lively sensations, at first lost in the general mass, are received. Think, for instance, of the first general impression of, say, the sphenoid bone disarticulated from a skull, or of many pictures seen a little too closely or a little too far away. I myself have a remembrance of having had strong impressions from sonatas of Beethoven before I knew anything of the musical notes. Avenarius and Petzoldt have overlooked the fact that the coming into consciousness of the elements is accompanied by a kind of secretion of characterisation.

Some of the simple experiments of physiological psychology illustrate the point to which I have been referring. If one stays in a dark room until the eye has adapted itself to the absence of light, and then for a second subjects oneself to a ray of coloured light, a sensation of illumination will be received, although it is impossible to recognise the quality of the illumination; something has been