40. The effect of English poetry at all times, but especially for the last hundred years, has been largely dependent on Vowel-music. This is by no means limited to the practice of what used to be called "making the sound suit the sense," though the two sometimes coincide. Vowel-music, not without occasional assistance from consonants, establishes a sort of accompaniment to the intelligible poetry—a prosodic setting.
"Fingering."
41. In the management of this, as of rhyme, pause, enjambment, and even the selection and juxtaposition of feet themselves, the poet often, if not as a rule in the best examples, uses particular sleights of fingering and execution parallel to those of the musical composer and performer. The results of this may appear to constitute verse-sections different from the feet. But these, however, never supersede feet, and are always resolvable into them; nor do they ever supply criteria for anything except the individual line or passage. They stand to prosody proper very much as delivery or elocution does to rhetoric. The conveniences of this "fingering," or poetic elocution, as well as sense and other things, may sometimes bring about alternative scansions, but all these connect themselves with and are obedient to the general foot system.[30]
Confusion of rhythms intolerable.
42. Despite this possibility of alternative scansion, and the other and commoner possibility of substitution of individual feet, iambic and trochaic, dactylic and anapæstic, metre or rhythm remain entirely distinct. Any system which regards these as merely different names for the same thing is self-condemned as disregarding the evidence, or rather verdict, of the ear.
FOOTNOTES:
[25] See above, Rule 2. It should be hardly necessary to remark that the explanations and exemplifications of these rules are to be furnished by the whole book, and that the Glossary in particular should be in constant use.
[26] E.g. "fāte" or "fāst" as opposed to "făt"; "mēet" to "dĕter"; "rīte" to "fĭt"; "ōmen" to "ŏtter"; "dūpe" to "bŭt."
[27] The combination of dactyl and trochee in English, however, will not produce the same effect as the combination of dactyl and spondee in Latin or Greek.
[28] Rules 26 and 27 do not apply to unmetrical verse, such as the old alliterative couplet-line, or the rhythmed prose-verse of Ossian, Blake, and Whitman.