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the doctrines of Diodorus we possess only fragmentary information, and not even the titles of his works axe known. It appears, however, certain that it was he who fully developed the dialectic art of the Megarics, which so frequently degenerated into mere shallow sophistry. (Cic. Acad. ii. 24, 47.) He seems to have been much occupied with the theory of proof and of hypothetical propositions. In the same manner as he rejected in logic the divisibility of the fundamental notion, he also maintained, in his physical doctrines, that space was indivisible, and consequently that motion was a thing impossible. He further denied the coming into existence and all multiplicity both in time and in space; but he considered the things that fill up space as one whole composed of an infinite number of indivisible particles. In this latter respect he approached the atomistic doctrines of Democritus and Diagoras. In regard to things possible, he maintained that only those things are possible which actually are or will be; possible was, further, with him identical with necessary; hence eventing which is not going to be cannot be, and all that is, or is going to be, is necessarv ; so that the future is as certain
and defined as the past. This theory approached the doctrine of fate maintained by the Stoics, and Chrysippus is said to have written a work, 7rep2 (Waro>f, against the views of Diodorus. (Diog. Laert. vii. 191 ; Cic. de Fato, 6, 7. 9, ad Fam. ix. 4.) He made use of the false syllogism
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called Sorites, and is said to have invented two others of the same kind, viz. the ^KeKaAv/^uei/os and the Keparivi-js Xoyos. (Diog. Laert. ii. 111.) Language was, with him, as with Aristotle, the result of an agreement of men among themselves. (Lersch, Sprachphilos. der Alt. i. p. 42; Deycks, de Megaricorum Doctrina^. 64, &c.)
7. Of croton, a Pythagorean philosopher, who is otherwise unknown. (lamblich. Vit.Pytliag. 35.)
10. Surnamed periegetes, was probably a native of Athens, and wrote on topographical and geographical subjects. He lived at the time of and after Alexander the Great; for it is clear, from some fragments of his works, that he wrote at the time when Athens had only twelve phylae, that is, previous to b. c. 308 ; and Athenaeus (xiii. p. 521) states, that Diodorus was acquainted with the rhetorician Anaximenes. We know only of two works of Diodorus Periegetes, viz. 1. TLepl st^w, which is frequently quoted by Harpocration and Stephanus of Byzantium, and from which a considerable number of statements are preserved in consequence. 2. riept yuz^aTcov, or on monuments. (Plut. TJiemist. 32, comp. Thes. 36, Cim. 16, Vit. X Oral, p. 849 ; Athen. xiii. p. 591.) It is not impossible that he may also be the author of a work on Miletus (irepl MiAvrrou ffvyypa^a^ Schol. ad Plut. Menex. p. 380; comp. Preller, Polemon. Fragm* p. 170, &c.)
12. The sicilian, usually called diodorus
siculus, was a contemporary of Caesar and Augustus. (Suid. s. v. AioScapos; Euseb. Citron, ad Ann. 1967.) He was born in the town of Agyrium in Sicily, where he became acquainted with the Latin language through the great intercourse between the Romans and Sicilians. Respecting his life we know no more than what he himself tells us (i. 4). He seems to have made it the business of his life to write an universal history from the earliest down to his own time. With this object in view, he travelled over a great part of Europe and Asia to gain a more accurate knowledge ol nations and countries than he could obtain from previous historians and geographers. For a long time he lived at Rome, and there also he made large collections of materials for his work by studying the ancient documents. He states, that he spent thirty years upon his work, which period probably includes the time he spent in travelling and collecting materials. As it embraced the history of all ages and countries, and thus supplied the place, as it were, of a whole library, he called it BigAto^KT?, or, as Eusebius (Praep. Evang. i. 6) says, Ei§\io9riK7] IcrropiKtf. The time at which he wrote his history may be determined pretty accurately from internal evidence: he not only mentions Caesar's invasion of Britain and his crossing the Rhine, but also his death and apotheosis (i. 4, iv. 19, v. 21, 25) : he further states (i. 44, comp. 83), that he was in Egypt in 01.190, that is, B. c. 20 ; and Scaliger (Animadv. ad Euseb. p. 156') has made it highly probable that Diodorus wrote his work after the year b. c. 8, when Augustus corrected the calendar and introduced the intercalation every fourth year.
The whole work of Diodorus consisted of fortv
books, and embraced the period from the earliest mythical ages down to the beginning of J. Caesar's Gallic wars. Diodorus himself further mentions, that the work was divided into three great sections. The first, which consisted of the first six books, contains the history of the mythical times previous to the Trojan war. The first books oi this section treat of the mythuses of foreign countries, and the latter books of those of the Greeks. The second section consisted of eleven books, which contained the history from the Trojan war down to the death of Alexander the Great; and the third section, which contained the remaining 23 books, treated of the history from the death of Alexander down to the beginning of Caesar's Gallic wars. Of this great work considerable portions are now lost. The first five books, which contain the early history of the Eastern nations, the Egyptians, Aethiopians, and Greeks, are extant entire; the sixth, seventh, eighth, ninth, and tenth books are lost; but from the eleventh down to the twentieth the work is complete again, and contains the history from the second Persian war, b. c. 480, down to the year B. c. 302. The remaining portion of the work is lost, with the exception of a considerable number of fragments and the Excerpta, which are preserved partly in Photius (Biol. Cod. 244), who gives extracts from books 31, 32, 33, 36, 37, 38, and 40, and partly in the Eclogae made at the command of Constantine Porphyrogenitus, from which they have successively been published by H. Stephens, Fulv. Ursinus, Valesius, and A. Mai. (Collect. Nova Script, ii. p. 1, &c., p. 568, &c.) The work of Diodorus is constructed upon the plan of annals, and the events of each year are placed