Moreover, except in dealing with very small surfaces, our eye moves about in our head and moves our head, and sometimes our whole body, along with it. An analogous active process undoubtedly distinguishes _listening_ from mere _hearing;_ and although psycho-physiology seems still at a loss for the precise adjustments of the inner ear corresponding to the minute adjustments of the eye, it is generally recognised that auditive attention is accompanied by adjustments of the vocal parts, or preparations for such adjustments, which account for the impression of _following_ a sequence of notes as we follow the appearance of colours and light, but as we do _not_ follow, in the sense of _connecting by our activity,_ consecutive sensations of taste or smell. Besides such obvious or presumable bodily activities requisite for looking and listening as distinguished from mere seeing and hearing, there is moreover in all perception of shape, as in all _grasping of meaning,_ a mental activity involving what are called _attention_ and _memory._ A primer of aesthetics is no place for expounding any of the various psychological definitions of either of these, let us call them, faculties. Besides I should prefer that these pages deal only with such mental facts as can be found in the Reader's everyday (however unnoticed) experience, instead of requiring for their detection the artificial conditions of specialised introspection or laboratory experiment. So I shall give to those much fought over words _attention_ and _memory_ merely the rough and ready meaning with which we are familiar in everyday language, and only beg the Reader to notice that, whatever psychologists may eventually prove or disprove _attention_ and _memory_ to be, these two, let us unscientifically call them _faculties,_ are what chiefly distinguishes _perception_ from _sensation._ For instance, in grasping or taking stock of a visible or an audible shape we are doing something with our attention, or our attention is doing something in us: a travelling about, a returning to starting points, a summing up. And a travelling about not merely between what is given simultaneously in the present, but, even more, between what has been given in an immediately proximate past, and what we expect to be given in an immediately proximate future; both of which, the past which is put behind us as past, and the past which is projected forwards as future, necessitate the activity of _memory._ There is an adjustment of our feelings as well as our muscles not merely to the present sensation, but to the future one, and a buzz of continuing adjustment to the past. There is a holding over and a holding on, a reacting backwards and forwards of our attention, and quite a little drama of expectation, fulfilment and disappointment, or as psychologists call them, of tensions and relaxations. And this little drama involved in all looking or listening, particularly in all taking stock of visible or