When the chords of the two triads are in perfect tune, Fantasy may--nay, must--associate with Feeling; supported by the Six, she will not degenerate, and out of this combination of all the elements arises Individuality. The individuality catches, like a lens, the light-impressions, reflects them, according to its nature, as a negative, and the hearer perceives the true picture. * * * In so far as taste participates in feeling, the latter--like all else--alters its forms of expression with the period. That is, one aspect or another of feeling will be favored at one time or another, onesidedly cultivated, especially developed. Thus, with and after Wagner, voluptuous sensuality came to the fore; the form of _intensification of passion_ is still unsurmounted by contemporary composers. On every tranquil beginning followed a swift upward surge. Wagner, in this point insatiable, but not inexhaustible, turned from sheer necessity to the expedient, after reaching a climax, of starting afresh softly, to soar to a sudden new intensification. Modern French writers exhibit a revulsion; their feeling is a reflexive chastity, or perhaps rather a restrained sensualism; the upstriving mountain-paths of Wagner are succeeded by monotonous plains of twilight uniformity. Thus "style" forms itself out of feeling, when led by taste. * * * The "Apostles of the Ninth Symphony" have devised the notion of "depth" in music. It is still current at face-value, especially in Germanic lands. There is a depth of feeling, and a depth of thought; the latter is literary, and can have no application to tones. Depth of feeling, by contrast, is psychical, and thoroughly germane to the nature of music. The Apostles of the Ninth Symphony have a peculiar and not quite clearly defined estimate of "depth" in music. _Depth_ becomes _breadth_, and the attempt is made to attain it through _weight_; it then discovers itself (through an association of ideas) by a preference for a _deep register_, and (as I have had opportunity to observe) by the insinuation of a second, mysterious notion, usually of a literary sort. If these are not the sole specific signs, they are the most important ones. To every disciple of philosophy, however, depth of feeling would seem to imply exhaustiveness in feeling, a complete absorption in the given mood.