It is therefore the natural representative of the inorganic kingdom of nature, which is insensible, insusceptible to fine impressions, and only determinable according to general laws. It must indeed never rise by one tone, for example, from a fourth to a fifth, for this produces in the upper parts the incorrect consecutive fifths and octaves; therefore, originally and in its own nature, it can never present the melody. If, however, the melody is assigned to it, this happens by means of counterpoint, i.e., it is an inverted bass – one of the upper parts is lowered and disguised as a bass; properly speaking, it then requires a second fundamental bass as its accompaniment. This unnaturalness of a melody lying in the bass is the reason why bass airs, with full accompaniment, never afford us pure, undisturbed pleasure, like the soprano air, which, in the connection of harmony, is alone natural. We may remark in passing that such a melodious bass, forcibly obtained by invertion, might, in keeping with our metaphysic of music, be compared to a block of marble to which the human form has been imparted: and therefore it is wonderfully suitable to the stone guest in "Don Juan."
But now we shall try to get somewhat nearer the foundation of the genesis of melody, which can be accomplished by analysing it into its constituent parts, and in any case will afford us the pleasure which arises from bringing to abstract and distinct consciousness what every one knows in the concrete, so that it gains the appearance of novelty.
Melody consists of two elements, the one rhythmical, the other harmonious. The former may also be described as the quantitative, the latter as the qualitative element, since the first is concerned with the duration, and the second with the pitch of the notes. In the writing of music the former depends upon the perpendicular, and the latter upon the horizontal lines. Purely arithmetical relations, thus relations of time, lie at the foundation of both; in the one case the relative duration of the notes, in the other
