Chapter XLVI: Book VI: chap. ix. of De Magnete, in which latter it is said that,

Thebitius, in order to establish a law for the great inequalities in the movements of the stars, held that the eighth sphere does not advance by continued motion from west to east, but that it has a sort of tremulous motion, “a movement of trepidation.”

REFERENCES.--“Hist. de la Médecine Arabe,” par Dr. Lucien
Leclerc, Paris, 1876, Vol. I. pp. 168–172; Dreyer (J.), “Tycho
Brahe,” 1890, pp. 354–356; Houzeau et Lancaster, “Bibl. Gén.,”
Vol. I. part i. pp. 466–467, 702; “History of Mathematics,”
Walter W. Rouse Ball, London, 1888, p. 153; “Abhandlungen zur
Geschichte der Mathematik,” Vol. VI, Leipzig, 1892, pp. 25–26.

=Themistius= of Paphlagonia--surnamed Euphrades--was a distinguished Greek orator and writer (about 315–390), whose philosophical works consist of commentaries in the form of paraphrases on some of Aristotle’s writings, one being upon the work “On Heaven,” and the other upon the twelfth book of the “Metaphysics.” The paraphrases were first published by Hermolaus Barbarus in 1481. Gilbert’s only reference is briefly made in _De Magnete_, Book II. chap. iv.

REFERENCES.--Schöll (Carl), “Geschichte d. G. Litt.,” Vol.
III. pp. 96, 388, or “Hist. de la Litt. Grecque,” Vol. VI. p.
141; Vol. VII. p. 121; Photius, _cod._ LXXIV; Fleury, “Hist.
Eccles.”; Tillemont, “Hist. des Emp.,” Vols. IV and V; Suidas,
art. “Themistius”; E. Baret, “De Themistio sophista ...” Paris,
1853; Brucker, “Hist. Crit. de la Phil.,” Vol. II. p. 484.

=Zoroaster=--Zarath ’ustra--Zerdusht--founder of the religious system contained in the Zend-Avesta (religious book of the Parsees, fire worshippers), is said to have been a native of Bactria, near the modern Balkh, and to have lived about 589–513 B.C. That he was an historical personage, equally with Buddha, Confucius and Mahomet, it is now scarcely possible to doubt.

His able biographer in the English Cyclopædia, London, 1868, Vol. VI. pp. 946–948, states that Zoroaster was a great astrologer and magician, and it is said at p. 95 of Mr. A. V. W. Jackson’s admirable work on Zoroaster, published in New York, 1899, that some of the original Nasks of the Avesta are reported to have been wholly scientific in their contents, and that the Greeks even speak of books purported to be by Zoroaster treating of physics, of the stars and of precious stones.

Zoroaster is merely named by Gilbert in manner shown at the Hermes Trismegistus entry.

REFERENCES.--“Life of Zoroaster,” prefixed to Anquetil du
Perron’s “Zend-Avesta,” Paris, 1771; Pastoret (Claude Emmanuel
J. P. de), “Zoroaster, Confucius et Mahomet comparés,” 1787;
Hyde (Thomas), “Historia ... Veterum Persarum ...” Oxford,
1760; “Zend-Avesta, Ouvrage de Zoroastre,” 2 vols. Paris, 1771;
Martin-Haug (I.), “Essays,” Bombay, 1862; Malcolm (Sir John),
“History of Persia,” 1815; Darmesteter, “Ormazd et Ahriman,”
Paris, 1877; Spiegel (Friedrich), “Erânische Alterthumskunde,”
Leipzig, 1871–1878; Chas. Rollin, “Ancient History,” London,
1845, Vol. I. pp. 234–235, 237; Ritter (Dr. Heinrich), “History
of Ancient Philosophy,” London, 1846, Vol. I. p. 52; “History
of the Decline and Fall of the Roman Empire,” Edward Gibbon
(Milman), Philad., 1880, Vol. I. pp. 229–230, notes, and, for
abridgment of his theology, pp. 231–234; also the Bury ed.,
London, 1900, Vol. I. pp. 197–198, 456–457; Vol. V. p. 487;
“Classical Studies in Honour of Hy. Drisler,” New York, 1894,
pp. 24–51; “The Fragments of the Persika of Ktesias,” by John
Gilmore, London, 1888, pp. 29–36, 95; “The Great Monarchies of
the Ancient Western World,” by Geo. Rawlinson, London, 1865,
Vol. I. p. 195; Vol. III. pp. 93, 98, 105, 127, 135–139, 164;
Vol. IV. pp. 110, 333; “Essai Historique,” Eug. Salverte, Paris,
1824, Vol. II. p. 503.

To the foregoing “Accounts of Early Writers,” can properly be added the following happy description of “The School of Athens,”[73] as coloured by Raphael and now to be seen among his frescoes in the papal state-apartments (_Stanze_--_Camere_) of the Vatican in Rome, for, it will be observed, most of the leading writers of which we have spoken are therein depicted:

=“The School of Athens”=--_Scuola d’Atene_--represents Philosophy in general, and is, with regard to expression and scholastic knowledge, a wonderful work; for every philosopher, by his posture and gestures, characterises his doctrines and opinions.... Beginning with the Ionian School, on the right, before the statue of Minerva, the aged person whose head is covered with linen, after the Egyptian manner is Thales; whom Raphael has represented as walking with a Stick, because, with that, he measured the Pyramids. Next to Thales is Archelaus of Messenia.... Behind them is Anaxagoras, resting his foot upon a marble book and almost hidden; in reference to the persecutions he underwent. The next figure, standing alone, at a little distance, to show that he is of another School, represents Pythagoras; who seems resolved to continue fixed at one spot, to show the unchangeableness of his ideas ... his head and body being turned different ways shows his metaphorical method of teaching important truths; and the crown, formed by his hair, refers to his initiation in all mysteries. The Figure leaning on a column is Parmenides; close to whom sits a youth, his adopted son Zeno, who is writing something short; referring to a Poem, by Parmenides, which compared, in two hundred lines, all the various Systems of Philosophy. Two masters only of the Eleatic School are introduced; because its followers were few in number. The metaphysics of Parmenides and Zeno gave rise to the Sceptical Philosophy of Pyrrho, expressed by the next figure.... At the opposite side of the Picture, talking with his fingers to a Figure in armour, supposed to represent Alcibiades, is Socrates ... who, like Thales, appears to be walking; because geometry was never taught in a fixed place.... Plato and Aristotle are placed together on a flight of steps in the centre of the Picture: Plato, representative of the speculative school, holds the Timæus: his sublime style is expressed by his attitude, denoting that his thoughts soar above this earth; and the cord attached to his neck marks his initiation at the Eleusinian Mysteries.... Aristotle, founder of ethical and physical philosophy, points earthward. The Figure in shade, nearest to Plato, is Archothæa.... The next Figure, in the same line, indicates roughness of character, and represents Xenocrates.... Behind Socrates and another Figure, Lasthenia, is a bearded old man Zeno of Citium, the founder of the sect called Stoics.... Behind Zeno of Citium is Antisthenes, in shade, because his School is expressed by that of Zeno. On the side of Aristotle, the tallest and most conspicuous Figure is Theophrastus ... said to be the portrait of Cardinal Bembo. The next figures are Strato of Lampsacus, Demetrius Phalereus, Callisthenes, Neophron, Glycon. Behind the last named is Heraclides and in rear of the disciples of Aristotle are Euclid of Megara and Eubulides of Miletus, his pupil: the last hated Aristotle, and is looking angrily at him. The lower part of the Picture, on the side with the statue of Apollo, represents the Philosophy of Leucippus, the disciple of Zeno, though the author of a very opposite system. He first taught the doctrine of Atoms.... Democritus, his most celebrated disciple, is sitting near him--booted, in the manner of his countrymen, the Abderites--and writing upon a stone table, shaped like the sarcophagi among which he used to meditate: he lost his fortune, therefore his dress indicates poverty; and he is represented in deep meditation, to show his uncommon studiousness. Opposite to Leucippus sits Empedocles, resting on a _cube_, though not with _contempt_, according to the principles of Leucippus; because Empedocles adhered, on some points, to the Pythagorean system. The youth holding, before Empedocles, Pythagoras’s Table of the Generation of Numbers and the Harmonies, is Meton.... The Figure in an Oriental costume bending over Pythagoras, represents Averrhoes, or one of the Magi, from which sect the Grecian Schools derived part of their doctrines. Behind Empedocles, is Epicharmus.... The Figure in a toga is Lucretius, placed near Empedocles, as having been his follower; but looking another way, because he differed from his master. This figure is the portrait of Francesco, Duke of Urbino, nephew to Julius II. The person crowned with vine-leaves and resting a book on a pedestal, is Epicurus, looking gay, according to the account given of him, and the Figure leaning upon his shoulder is Metrodorus; next to whom is Heraclitus, wearing a black veil, like that of the Ephesian Diana, in whose temple he exposed his works. Seated on the second step, near the centre of the Picture, is Diogenes, and below him is a Portrait of the great architect, Bramante (under the character of Archimedes), who is tracing an hexagonal figure on the pavement ... the enthusiastic-looking person who points to the hexagon, is supposed to be Archytas of Tarentum; the boy on his knees, is Phenix of Alexandria; and behind him, with a hand on his back, is Ctesibius. In the angle of the picture are Zoroaster and Ptolemy, one holding a celestial and the other a terrestrial globe, as representatives of Astronomy and Geometry; the figure wearing a crown, under the character of Zoroaster, being Alphonso, King of Arragon, Sicily and Naples; the person with a black turban on his head, and likewise holding a Globe, may probably represent Confucius: and the two persons with whom Alphonso seems conversing are portraits of Raphael and of his master Pietro Perugino. The statues and _bassi-relievi_ with which Raphael has ornamented his scene, are emblematical of the different Schools of Philosophy: and the picture, in point of composition, is considered to be his _chef-d’œuvre_, the Sibyls of S^a Maria della Pace excepted.

A more detailed description of the above will be found in the works of Trendelenburg (Berlin, 1843), and of Richter (Heidelberg, 1882), bearing title “Ueber Rafael’s Schule von Athen.”

APPENDIX II

DISCOVERIES MADE BY WILLIAM GILBERT--DESIGNATED IN
“DE MAGNETE” BY THE LARGER ASTERISKS

(_Alluded to in the Gilbert_ A.D. _1600 Article, p. 83_)

Book I. chap. iii. The loadstone ever has and ever shows its
poles, which look toward the poles of the earth and move toward
them and are subject to them.

Book I. chap. vi. The loadstone attracts iron ore, as well as
the smelted metal, the best iron, _acies_, being the most
readily attracted.

Book I. chap. ix. Iron ore attracts iron ore.

Book I. chap. x. Iron ore has and acquires poles, and arranges
itself with reference to the earth’s poles.

Book I. chap. xi. Wrought-iron, not magnetized by the loadstone,
attracts iron.

Book I. chap. xii. A long piece of iron, even not magnetized,
assumes a north and south direction.