To this antiquity was so attentive, that circumstances were sometimes added, which, having no parallels, served only to fill the imagination, and produced what Perrault ludicrously called "comparisons with a long tail." In their similes the greatest writers have sometimes failed; the ship-race, compared with the chariot-race, is neither illustrated nor aggrandised; land and water make all the difference: when Apollo, running after Daphne, is likened to a greyhound chasing a hare, there is nothing gained; the ideas of pursuit and flight are too plain to be made plainer; and a god and the daughter of a god are not represented much to their advantage by a hare and dog. The simile of the Alps has no useless parts, yet affords a striking picture by itself; it makes the foregoing position better understood, and enables it to take faster hold on the attention; it assists the apprehension, and elevates the fancy.
Let me likewise dwell a little on the celebrated paragraph, in which it is directed that "the sound should seem an echo to the sense;" a precept which Pope is allowed to have observed beyond any other English poet.
