The poems of Catullus fall naturally into three divisions, doubtless made by the poet himself. These are the short lyrical pieces in various metres, containing the best known of those to Lesbia, besides others to his most intimate friends; then come the longer poems, mostly in heroic or elegiac metre, representing the higher flights of his genius; and lastly, the epigrams on divers subjects, all in the elegiac metre, of which both the list and the text are imperfect. In all we meet with the same careless grace and simplicity both of thought and diction, but all do not show the same artistic skill. The judgment that led Catullus to place his lyric poems in the foreground was right. They are the best known, the best finished, and the most popular of all his compositions; the four to Lesbia, the one to Sirmio, and that on Acme and Septimus, are perhaps the most perfect lyrics in the Latin language; and others are scarcely inferior to them in elegance. The hendecasyllabic rhythm, in which the greater part are written, is the one best suited to display the poet's special gifts. Of this metre he is the first and only master. Horace does not employ it; and neither Martial nor Statius avoids monotony in the use of it. The freedom of cadence, the varied caesura, and the licences in the first foot, [122] give the charm of irregular beauty, so sweet in itself and so rare in Latin poetry; and the rhythm lends itself with equal ease to playful humour, fierce satire, and tender affection. Other measures, used with more or less success, are the iambic scazon, [123] the chorianibic, the glyconic, and the sapphic, all probably introduced from the Greek by Catullus. Of these the sapphic is the least perfected. If the eleventh and fifty-first odes be compared with the sapphic odes of Horace, the great metrical superiority of the latter will at once appear. Catullus copies the Greek rhythm in its details without asking whether these are in accordance with the genius of the Latin language. Horace, by adopting stricter rules, produces a much more harmonious effect. The same is true of Catullus's treatment of the elegiac, as compared with that of Propertius or Ovid. The Greek elegiac does not require any stop at the end of the couplet, nor does it affect any special ending; words of seven syllables or less are used by it indifferently. The trisyllabic ending, which is all but unknown to Ovid, occurs continually in Catullus; even the monosyllabic, which is altogether avoided by succeeding poets, occurs once. [124] Another licence, still more alien from Roman usage, is the retention of a short or unelided syllable at the end of the first penthemimer. [125] Catullus's elegiac belongs to the class of half-adapted importations, beautiful in its way, but rather because it recalls the exquisite cadences of the Greek than as being in itself a finished artistic product.