It has been said that the feeling of tonality is a motor image or "form-quality" and that the image of the tonic persists throughout every sequence of tones in a melody. Now these are not only felt as having a certain relation to the tonic; that relation is an active one. It was said that we had a positive desire to end on a certain tone, and that a tendency to pass to that tone was bound up with the hearing of another tone. The degree of this tendency is determined by their relation. The key, the tonality, is determined by the consensus of intervals which have been felt as more or less consonant. Then steps in this scale which come near to the great salient points--that is, the points of greatest consonance, which is unity, which is rest--are felt as suggesting them. This is the reason why a semitone progression is felt as so compelling. In taking the scale upward, C to C', that element in the tone- Space already clearly foreshadowed by the previous tones is C'; B is so near that it is almost C'--it seems to cry aloud to be completed by C'. Then the tendency to move from B to C' is especially strong. In the same way a chromatic note suggests most strongly the salient point in the scheme to which it is nearest--and "tends" to it as to a point of comparative rest. The difference between the major and minor scales may be found in the lesser definiteness<1> with which the tendency to progression, in the latter, is felt--"a condition of hovering, a kind of ambiguity, of doubt, to which side the movement shall proceed." We may then understand a melody as ever tending with various degrees of urgency, of strain, to its centre of gravity, the tonic. <1> F. Weinmann, _Zeitschr. f. Psychol._, Bd. 35, p. 360. It is from this point of view that we can see the cogency of Gurney's remark, that when music seems to be yearning for unutterable things, it is really yearning only for the next note. "In this step from the state of rest into movement and return, the coming again to rest; on what circuitous ways, with what reluctances and hesitations; whether quick and decisively or gradually and unnoticed--therein consists the nature of melody."<1> <1> Weinmann, op. cit. Or in Gurney's more eloquent description, "The melody may begin by pressing its way through a sweetly yielding resistance to a gradually foreseen climax; whence again fresh expectation is bred, perhaps for another excursion, as it were, round the same centre but with a bolder and freer sweep,...to a point where again the motive is suspended on another temporary goal; till after a certain number of such involutions and evolutions, and of delicately poised leanings and reluctances and yieldings, the forces so accurately measured just suffice to bring it home, and the sense of potential and coming integration which has underlain all our provisional adjustments of expectation is triumphantly justified."<1> <1> Op. cit., p. 165.