It is not proposed to follow the argument of this article in detail, but to center attention upon those parts of it, especially the concluding pages, which have a special interest in connection with the subject under discussion. Dewey returns, in this article, to the situation of effort at adjustment; to the situation in which an effort is made to determine the proper response to a stimulus. The opening pages are devoted, in the first place, to a discussion of the distinction between conscious effort and the mere expenditure of energy or effort as it appears to an outsider, and, in the second place, to maintaining, by means of examples, the proposition that the sense of effort is sensationally mediated. "How then does, say, a case of perception with effort differ from a case of 'easy' or effortless perception? The difference, I repeat, shall be wholly in sensory quale; but in _what_ sensory quale?"[124] The conscious sense of effort arises, Dewey answers, when there is a rivalry or conflict between two sensational elements in experience. "In the case of felt effort, certain sensory quales, usually fused, fall apart in consciousness, and there is an alternation, an oscillation, between them, accompanied by a disagreeable tone when they are apart, and an agreeable tone when they become fused again."[125] These two sets of sensory elements have each a significance in terms of adjustment; one of them is a correlate of a habit, or fixed mode of response, and the other is an intruder which resists absorption into, or fusion with, the dominant images of the current habit or purpose. The same idea of a natural tendency to persist in a habitual mode of regarding things was met with in the last two chapters, and is qualified here by the addition of the idea that each sensory element represents a typical mode of response on the part of the organism. Dewey illustrates his notion by the case of learning to ride a bicycle. "Before one mounts one has perhaps a pretty definite visual image of himself in balance and in motion. This image persists as a desirability. On the other hand, there comes into play at once the consciousness of the familiar motor adjustments,--for the most part, related to walking. The two sets of sensations refuse to coincide, and the result is an amount of stress and strain relevant to the most serious problems of the universe."[126] In another passage, which brings out even more clearly the rivalry of the two sets of sensations, he says: "It means that the activity already going on (and, therefore, reporting itself sensationally) resists displacement, or transformation, by or into another activity which is beginning, and thus making its sensational report."[127]