While, however, the oratorical preoccupation prevented Rhetoric from attaining the development which might otherwise have been expected, both Rhetoric and Poetics were very seriously obstructed by the unequal growth of literary kinds within Greek itself, and by the absence of any other literature with which to compare such kinds as existed, and by which to discern the absence of those that did not exist. The whole of Greek Poetic was prejudicially affected—and the affection has continued to be a source of evil in all criticism since—by the accidental lateness of prose fiction in Greek literature; just as the whole of Greek Rhetoric was prejudicially affected by the accidental predominance of Greek oratory. The habit—in the main a sound one—of generalising from the actual facts, led to very arbitrary theories of more literary kinds than one. It was assumed that what we may call “periodic” Epic was the only kind; and Romance, which may be very fairly called a “loose” Epic, was barred as improper. Still more was the same distinction ignored in drama; where a single, though in its way very perfect, form of Tragedy was arbitrarily assumed to be the only one possible or permissible. So the accidental and easily separable extravagances and licences of the Ancient Comedy were allowed to obscure its merits, and depress its rank, in the eyes of the critic. Lyric—perhaps the very highest of all literary kinds, as it must be the oldest, and is the most perennial—became a mere appendage to tragedy. The great kind of History, in which Greece had already produced such magnificent examples, was in the same way regarded as a sort of baggage-waggon to oratorical Rhetoric; and the dialogic form which was preferred in philosophy, partly owing to the habits of the nation, and partly owing to the towering eminence of Plato, was in the same way, or much the same way, allowed or forced to attach itself to the same train.