For it is a commonplace that the more suavely efficient a habit the more unconsciously it operates. Only a hitch in its workings occasions emotion and provokes thought. Carlyle and Rousseau, hostile in temperament and outlook, yet agree in looking at consciousness as a kind of disease, since we have no consciousness of bodily or mental organs as long as they work at ease in perfect health. The idea of disease is, however, aside from the point, unless we are pessimistic enough to regard every slip in total adjustment of a person to its surroundings as something abnormal--a point of view which once more would identify well-being with perfect automatism. The truth is that in every waking moment, the complete balance of the organism and its environment is constantly interfered with and as constantly restored. Hence the "stream of consciousness" in general, and in particular that phase of it celebrated by William James as alternation of flights and perchings. Life is interruptions and recoveries. Continuous interruption is not possible in the activities of an individual. Absence of perfect equilibrium is not equivalent to a complete crushing of organized activity. When the disturbance amounts to such a pitch as that, the self goes to pieces. It is like shell-shock. Normally, the environment remains sufficiently in harmony with the body of organized activities to sustain most of them in active function. But a novel factor in the surroundings releases some impulse which tends to initiate a different and incompatible activity, to bring about a redistribution of the elements of organized activity between those have been respectively central and subsidiary. Thus the hand guided by the eye moves toward a surface. Visual quality is the dominant element. The hand comes in contact with an object. The eye does not cease to operate but some unexpected quality of touch, a voluptuous smoothness or annoying heat, compels a readjustment in which the touching, handling activity strives to dominate the action. Now at these moments of a shifting in activity conscious feeling and thought arise and are accentuated. The disturbed adjustment of organism and environment is reflected in a temporary strife which concludes in a coming to terms of the old habit and the new impulse.