Upon this poem, in place of facts and deduction from fact, or from natural law, were built systems of feet, metres, rhythms, rules, – rules that contradict each other every five minutes, and for nearly all of which there may be found twice as many exceptions as examples. If any one has a fancy to be thoroughly confounded – to see how far the infatuation of what is termed ›classical scholarship‹ can lead a book-worm in the manufacture of darkness out of sunshine, let him turn over, for a few moments, any of the German Greek prosodies. The only thing clearly made out in them is a very magnificent contempt for Leibnitz' principle of ›a sufficient reason.‹

To divert attention from the real matter in hand by any farther reference to these works, is unnecessary, and would be weak. I cannot call to mind, at this moment, one essential particular of information that is to be gleaned from them; and I will drop them here with merely this one observation: that, employing from among the numerous ›ancient‹ feet the spondee, the trochee, the iambus, the anapæst, the dactyl, and the cæsura alone, I will engage to scan correctly any of the Horatian rhythms, or any true rhythm that human ingenuity can conceive. And this excess of chimerical feet is, perhaps, the very least of the scholastic supererogations. Ex uno disce omnia. The fact is that Quantity is a point in whose investigation the lumber of mere learning may be dispensed with, if ever in any. Its appreciation is universal. It appertains to no region, nor race, nor era in especial. To melody and to harmony the Greeks hearkened with ears precisely similar to those which we employ for similar purposes at present; and I should not be condemned for heresy in asserting that a pendulum at Athens would have vibrated much after the same fashion as does a pendulum in the city of Penn.

Verse originates in the human enjoyment of equality, fitness. To this enjoyment, also, all the moods of verse – rhythm, metre, stanza, rhyme, alliteration, the refrain, and other analogous effects – are to be referred. As there are some readers who habitually confound rhythm and metre, it may be as well here to say that the former concerns the character of feet (that is, the arrangements of syllables) while the latter has to do with the number of these feet. Thus, by ›a dactylic rhythm‹ we express a sequence of dactyls. By ›a dactylic hexameter‹ we imply a line or measure consisting of six of these dactyls.

To return to equality. Its idea embraces those of similarity, proportion, identity, repetition, and adaptation or fitness. It might not be very difficult to go even behind the idea of equality, and show both how and why it is that the human nature takes pleasure in it, but such an investigation would, for any purpose now in view, be supererogatory. It is sufficient that the fact is undeniable – the fact that man derives enjoyment from his perception of equality. Let us examine a crystal. We are at once interested by the equality between the sides and between the angles of one of its faces: the equality of the sides pleases us; that of the angles doubles the pleasure. On bringing to view a second face in all respects similar to the first, this pleasure seems to be squared; on bringing to view a third, it appears to be cubed, and so on. I have no doubt, indeed, that the delight experienced, if measurable, would be found to have exact mathematical relations such as I suggest; that is to say, as far as a certain point, beyond which there would be a decrease in similar relations.

The perception of pleasure in the equality of sounds is the principle of Music. Unpractised ears can appreciate only simple equalities, such as are found in ballad airs. While comparing one simple sound with another they are too much occupied to be capable of comparing the equality subsisting between these two simple sounds, taken conjointly, and two other similar simple sounds taken conjointly. Practised ears, on the other hand, appreciate both equalities at the same instant – although it is absurd to suppose that both are heard at the same instant. One is heard and appreciated from itself: the other is heard by the memory; and the instant glides into and is confounded with the secondary, appreciation. Highly cultivated musical taste in this manner enjoys not only these double equalities, all appreciated at once, but takes pleasurable cognizance, through memory, of equalities the members of which occur at intervals so great that the uncultivated taste loses them altogether. That this latter can properly estimate or decide on the merits of what is called scientific music, is of course impossible. But scientific music has no claim to intrinsic excellence – it is fit for scientific ears alone. In its excess it is the triumph of the physique over the morale of music. The sentiment is overwhelmed by the sense.