As regards their form, we observe that they are moulded strictly upon the Greek, some of those on lighter themes being translations or close imitations. But in naturalising the Greek metres, he has accommodated them with the rarest skill to the harmonies of the Latin tongue. The Virgilian movement differs not more from the Homeric, than does the Horatian sapphic or alcaic from the same metres as treated by their Greek inventors. The success of Horace may be judged by comparing his stanzas with the sapphics of Catullus on the one hand, and the alcaics of Statius on the other. The former struggle under the complicated shackles of Greek prosody; the latter move on the stilts of school-boy imitation. In language he is singularly choice without being a purist; agreeably to their naturalised character he has interspersed the odes with Greek constructions, some highly elegant, others a little forced and bordering upon experiments on language. [57] The poetry of his language consists not so much in its being imaginative, as in its employing the fittest words in the fittest places. Its general level is that of the best epistolary or oratorical compositions, according to the elevation of the subject. He loves not to soar into the empyrean, but often checks Pegasus by a strong curb, or by a touch of irony or an incongruous allusion prevents himself or his reader being carried away. [58] This mingling of irony and earnest is thoroughly characteristic of his genius. To men of realistic minds it forms one of the greatest of its charms.