The fifth book relates to words expressive of time and its divisions, and to those things which are done in the course of time. He begins with the months and days consecrated to the service of the gods, or performance of accustomed rites. Things which happen during the lapse of time, are divided into three classes, according to the three great human functions of thought, speech, and act. The third class, or actions, are performed by means of the external senses; the mention of which introduces the explication of those terms which express the various operations of the senses; and the book terminates with a list of vocables derived from the Greek. These two books relate the common employment of words. In the sixth, the author treats of poetic words, and the poetic or metaphoric use of ordinary terms, of which he gives examples. Here he follows the same arrangement already adopted—speaking first of places, and then of time, and showing, as he proceeds, the manner in which poets have changed or corrupted the original signification of words. Such is the first division of the work of Varro, forming what he himself calls the etymological part. He admits that it was a subject of much difficulty and obscurity, since many original words had become obsolete in course of time, and of those which survived, the meaning had been changed or had never been imposed with exactness. The second division, which extended from the commencement of the seventh to the end of the twelfth book, comprehended the accidents of words, and the different changes which they undergo from declension, conjugation, and comparison. The author admits but of two kinds of words—nouns and verbs, to which he refers all the other parts of speech. He distinguishes two sorts of declensions, of which he calls one arbitrary, and the other natural or necessary; and he is thenceforth alternately occupied with analogy and anomaly. In the seventh book he discusses the subject of analogy in general, and gives the arguments which may be adduced against its existence in nouns proper: In the eighth, he reasons like those who find analogies everywhere. Book ninth treats of the analogy and anomaly of verbs, and with it the fragment we possess of Varro’s treatise terminates. The three other books, which completed the second part, were of course occupied with comparison and the various inflections of words. The third part of the work, which contained twelve books, treated of syntax, or the junction of words, so as to form a phrase or sentence. It also contained a sort of glossary, which explained the true meaning of Latin vocables.