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medes, who was slain b.c. 212. The inference drawn from the hydraulic invention of Ctesibius is untenable, as he might well be employed to ornament a temple already existing, and there is no ground for believing that the Marcellus, to whom Athenaeus dedicated his work, is the person assumed. On the contrary, Philon, and therefore the rest, must have lived after the time of Archi­medes, as we learn from Tzetzes (Cliil. ii. v. 152) that Philon, in one of his works, mentions Archi­medes. There is no reason, therefore, why we should reject the express statement of Athenaeus (iv. p. 174, c.), where he mentions Ctesibius as flourishing in the time of the second Euergetes, Ptolemy Physcon, who began to reign b.c. 146. Fabricius, with odd inconsistency, places the era of Philon at A. u. c. 601= b.c. 153, which is suffi­ciently correct. Consequently Heron must be placed later. (See Schweighauser, ad Athenaeum, vol. vii. p. 637, &c.; Clinton, F. H. vol. iii. p. 535.) All that we know of his history is derived from his


own notices in the work to be mentioned imme­diately ; that he had been at Alexandria and Rhodes, and had profited by his intercourse with the engineers of both places (pp. 51, 80, 84).

Among his works is one wherein he took a wide range, treating of the formation of harbours, of levers, and the other mechanical powers ; as well as all other contrivances connected with the be­sieging and the defending of cities. Hence, Vitru-vius (vii. Praefat.) mentions him among the writers on military engineering. Of this, two books, the fourth and fifth, have come down to us, and are printed in the Veterum Mathematicorum Opera, of Thevenot, Paris, 1693, wherein Pouchard revised the fragment of Philon, which occurs pp. 49—104. The fourth book is headed, ck r£v QiXtavos /SeAoTTouVcoSz/, and the general subject is the manufacture of missiles. He mentions in it an invention of his own, which he denominates o£u&=A?7s (p. 56). In the fifth book we are shocked to find that while recommending a besieging army to devastate the open country on the approach of an enemy, he advises them to poison the springs and the grain which they cannot dispose of (p. 103) ; and what renders this the worse, he mentions his having treated of poisons in his book on the preparations that should be made for a war. What principally attracted attention to this work in modern times is his notice of the invention of Ctesibius (p. 77. &c.). The instrument described by him, named dUpoToyos, acted on the property of air when condensed, and is, evidently, in principle the same with the modern air-gun. The subject is investigated by Albert Louis Meister in a short treatise entitled De Catapulta polybola Commentatio, qua locus Philonis Meclianici, in libro iv. de telorum constructione extans, illustratur, Gottingae, 1768. It has also attracted the notice of Dutens, in his Oriyine de Decouvertes attributes auso Modernes, vol. i. p. 265, ed. Paris. 1776. Further details of this fragment will be found in Fabricius, vol. iv. p. 231, &c. According to Montucla, Philon was well skilled in Geometry, and his solution of the problem of the two mean proportionals (Pappus, Coll. Math. lib. viii.), although the same in prin­ciple with that of Apollonius, has its peculiar merits in practice. We learn from Pappus (I.e.) that he wrote a treatise on mechanics, the object of which was nearly the same as Heron's. (Montucla, vol. i. p. 268.)



To Philon of Byzantium is attributed another work, Hepl twv en-Tcfc 3-ea^arw^, On the Seven Wonders oftlie World. But Fabricius (Bibl. Graec. vol. iv. p. 233) thinks that it is impossible that an eminent mechanician like Philon Byzautinus could have written this work, and conjectures that it was written by Philon Heracleiotes. No one can doubt that he is right in his first conjecture, but it seems more probable that it is the production of a later rhetorical writer, who gave it the name of Philon of Byzantium, as that of a man, who, from his life and writings, might be supposed to have chosen it as a subject for composition. It exists in only one MS. which, originally in the Vatican, was in 1816, in Paris, No. 389. It was first edited by Allatius, Rome, 1640, with a loose Latin translation, and desultory, though learned notes. It was re-edited from the same MS. by Dionysius Salvagnius Boes-sius, ambassador from the French court to the pope, and included in his Miscella, printed at Leyden, 1661. This edition has a more correct translation than that of Allatius, but abounds in typographical errors, there being no fewer than 150 in 14 pages. Gronovius reprinted the edition of Allatius, in his Thesaurus Antiquitatum Graecarum^ vol. vii. pp. 2645—2686. It was finally reprinted at Leipzig, 1816, edited by J. C. Orelli. This edition, which is undoubtedly the best, contains the Greek, with the translations of both Allatius and Boessius, (with the exception of a fragment of a mutilated chapter, reprinted from the translation of L. Hoi-stein, which originally appeared in Gronovius, ibid. vol. vii. p. 389), the notes of Allatius and others, along with some passages from other writers who had treated of the same or similar subjects, the fragments of the sophist Callinicus, and Adrian the Tyrian, and an Index Graecitatis. The wonders treated of are the Hanging Gardens, the Pyramids, the statue of Jupiter Olympius, the .Walls of Ba­bylon, the Colossus of Rhodes, the Temple of Artemis at Ephesus, and, we may presume, from the prooemium, the Mausoleum ; but the last is entirely wanting, and we have only a fragment of the Ephesian temple. The style, though not wholly devoid of elegance, is florid and rhetorical. Orelli regrets the lost portions, as he thinks that the author had actually beheld the three last won­ders. There does not appear to be much ground for this, and the whole seems to have been adopted from the reports of others.

3. carpathius (from Carpathus, an island north-east of Crete), or rather carpasius (from Carpasia, a town in the north of Cyprus). His birth-place is unknown ; but he derived this cog­nomen from his having been ordained bishop of Carpasia, by Epiphanius, the well-known bishop of Constantia. According to the statement of Joannes and Polybius, bishop of Rhinoscuri, in their life of Epiphanius, Philon, at that time a deacon, was sent, along with some others, by the sister of the emperors Arcadius and Honorius, to bring Epipha­nius to Rome, that, through his prayers and the laying on of hands, she might be saved from a dan­gerous disease under which she was labouring. Pleased with Philon, Epiphanius not only ordained him bishop of Carpasia, but gave him charge of his own diocese during his absence. This was about the beginning of the fifth century (Cave, Hist. Litt. p. 240, ed, Genev.). Philo Carpasius is principally known from his Commentary on the Canticles, which he treats allegorically. A Latin

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