" VIII. On water supply--the different properties of different waters--the way to find them, test them, and convey them into the city. " IX. On sun dials and other modes of measuring time. " X. On machines of all kinds, civil and military. As will be seen from this analysis, the work is both comprehensive and systematic; it was of great service in the Middle Ages, when it was used in an abridged form (sufficiently ancient, however,) which we still possess. Antiquarian research was carried on during this period with much zeal. Many illustrious scholars are mentioned, none of whose works have come down to us, except in extremely imperfect abridgments. FENESTELLA (52 B.C.-22 A.D.) wrote on various legal and religious questions, on miscellaneous topics, as literary history, the art of good living, various points in natural history, &c. for which he is quoted as an authority by Pliny. His greatest work seems to have been _Annales_, which were used by Plutarch. It is probable, however, that in these he showed his special aptitude for archaeological research, and passed over the history in a rapid sketch. Special grammatical studies were carried on by VERRIUS FLACCUS, a freedman, whose great work, _De Verborum Significatu_, the first Latin lexicon conducted on an extensive scale, we possess in an abridgment by Festus. Its size may be conjectured from the fact that the letter A occupied four books, P five, and so on; and that Festus's abridgment consisted of twenty large volumes. [61] It was a rich storehouse of knowledge, the loss of which is much to be lamented. Another freedman, C. JULIUS HYGINUS (64 B.C.-16 A.D.?), who was also keeper of Augustus's library on the Palatine, manifested an activity scarcely less encyclopaedic than that of Varro. Of his multifarious works we possess two short treatises which pass under his name, the first on mythology, called _Fabulae_, a series of extracts from his _Genealogiae_, which we have in an abridgment; the second on astronomy, extending, though this is also in an abridged form, to four books. A few details of his life are given by Suetonius. He was a Spaniard by birth, though some believed him to be an Alexandrian, since Caesar brought him to Rome after the Alexandrine War; he attended at Rome the lectures of the grammarian Cornelius Alexander, surnamed Polyhistor. He was an intimate acquaintance of Ovid, [62] and is said to have died in great poverty. It is doubtful whether the works we possess were written by him in his youth, or are the production of an imperfectly educated abbreviator. Bursian, quoted by Teuffel, [63] thinks it probable that in the second half of the second century of the Christian era, a grammarian made a very brief abridgment of Hyginus's work entitled _Genealogiae_, and to this added a treatise on the whole mythology so far as it concerned poetical literature, compiled from good sources. This