"Now the harmony of prose arises from the same principle with that which constitutes the harmony of verse; viz. numbers; or such a disposition of the words as throws them into just metrical feet, but very different from those which constitute any species of verse."--Essay on the Power of Numbers, &c. page 4. Introd. "A good stile is both _expressive_ and _harmonious_. The former depends on the happy choice of the words to convey our ideas; the other on the happy choice of numbers in the disposition of the words. The language of some is expressive, but unharmonious; that is, the writer's words strongly convey his sentiments, but the order in which they are placed creates a sound unpleasant to the ear. The stile of others is harmonious but not expressive; where the periods are well turned and the numbers well adapted, but the sense obscure. The former satisfies the mind, but offends the ear; the latter gratifies the ear, but disgusts the mind. A good stile entertains and pleases both," &c---- Ibm. 2d. Part, page 17. The author proceeds to illustrate his doctrines by showing in what the harmony of prose consists. He remarks that the words should in some degree be an echo to the sense, in prose as well as verse. He proceeds--"Every sentence may be conceived as divisible into distinct and separate clauses; every clause, where there is an apparent cessation of the voice, should always end with a generous foot; and all the preceding numbers be so intermixt, that the short ones be duly qualified by the succeeding long ones; reserving the best and most harmonious number for the cadence." To show how much depends on the proper arrangement of words, he quotes the following instance--"A divine, speaking of the Trinity, hath this expression--It is a mystery which we firmly believe the truth of, and humbly adore the depth of." Here the language is expressive, but not harmonious; not merely because the clauses end with the particle _of_, but because they abound with feeble numbers, _Pyrrhics_ and _Trochees_. Let us change the disposition of the feet--"It is a mystery, the truth of which we firmly believe, and the depths of which we humbly adore." The difference in the melody is very perceiveable. The force and music of the last disposition is increased by the Iambics and Anapæsts. The most forceable feet, and those best adapted to sublime and serious subjects, are those which contain the most long syllables, or end in a long syllable; as the Iambic, the Spondee, the Anapæst. The weak feet are those which have the most short syllables or end in a short syllable; as the Pyrrhic, the Trochee, the Tribrach.