The treatment of Castelvetro, in his commentary on the _Poetics_ (1570), is at times much more in accord with the true Aristotelian conception than most of the other Renaissance writers. While following Aristotle in asserting that verse is not of the essence of poetry, he shows that Aristotle himself by no means intended to class as poetry works that imitated in prose, for this was not the custom of Hellenic art. Prose is not suited to imitative or imaginative subjects, for we expect themes treated in prose to be actual facts.[75] "Verse does not distinguish poetry," says Castelvetro, "but clothes and adorns it; and it is as improper for poetry to be written in prose, or history in verse, as it is for women to use the garments of men, and for men to wear the garments of women."[76] The test of poetry therefore is not the metre but the material. This approximates to Aristotle's own view; since while imitation is what distinguishes the poetic art, Aristotle, by limiting it to the imitation of human life, was, after all, making the matter the test of poetry. Castelvetro, however, arrives at this conclusion on different grounds. Science he regards as not suitable material for poetry, and accordingly such writers as Lucretius and Fracastoro are not poets. They are good artists, perhaps, or good philosophers, but not poets; for the poet does not attempt to discover the truth of nature, but to imitate the deeds of men, and to bring delight to his audience by means of this imitation. Moreover, poetry, as will be seen later, is intended to give delight to the populace, the untrained multitude, to whom the sciences and the arts are dead letters;[77] if we concede these to be fit themes for poetry, then poetry is either not meant to delight, or not meant for the ordinary people, but is intended for instruction and for those only who are versed in sciences and arts. Moreover, comparing poetry with history, Castelvetro finds that they resemble each other in many points, but are not identical. Poetry follows, as it were, in the footsteps of history, but differs from it in that history deals with what has happened, poetry with what is probable; and things that have happened, though probable, are never considered in poetry as probable, but always as things that have happened. History, accordingly, does not regard verisimilitude or necessity, but only truth; poetry must take care to establish the probability of its subject in verisimilitude and necessity, since it cannot regard truth. Castelvetro in common with most of the critics of the Renaissance seems to misconceive the full meaning of ideal truth; for to the Renaissance--nay, even to Shakespeare, if we are to consider as his own various phrases which he has put into the mouths of his dramatic characters--truth was regarded as coincident with fact; and nothing that was not actual fact, however subordinated to the laws of probability and necessity, was ever called truth.