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A Budget of Paradoxes, Volume I by De Morgan

A la librairie encyclopedique de Roret


Socrates Scholasticus was born at Constantinople c. 379, and died after 439. His _Historia Ecclesiastica_ (in Greek) covers the period from Constantine the Great to about 439, and includes the Council of Nicaea. The work was printed in Paris 1544.

[745] Theodoretus or Theodoritus was born at Antioch and died about 457. He was one of the greatest divines of the fifth century, a man of learning, piety, and judicial mind, and a champion of freedom of opinion in all religious matters.

[746] He died in 417. He was a man of great energy and of high attainments.

[747] He died in 461, having reigned as pope for twenty-one years. It was he who induced Attila to spare Rome in 452.

[748] He succeeded Leo as pope in 461, and reigned for seven years.

[749] Victorinus or Victorius Marianus seems to have been born at Limoges. He was a mathematician and astronomer, and the cycle mentioned by De Morgan is one of 532 years, a combination of the Metonic cycle of 19 years with the solar cycle of 28 years. His canon was published at Antwerp in 1633 or 1634, _De doctrina temporum sive commentarius in Victorii Aquitani et aliorum canones paschales_.

[750] He went to Rome about 497, and died there in 540. He wrote his _Liber de paschate_ in 525, and it was in this work that the Christian era was

first used for calendar purposes.

[751] See note 259, page 126.

[752] Johannes de Sacrobosco (Holy wood), or John of Holywood. The name was often written, without regard to its etymology, Sacrobusto. He was educated at Oxford and taught in Paris until his death (1256). He did much to make the Hindu-Arabic numerals known to European scholars.

[753] See note 36, page 44.

[754] See note 45, page 48.

[755] The Julian year is a year of the Julian Calendar, in which there is leap year every fourth year. Its average length is therefore 365 days and a quarter.--A. De M.

[756] Ugo Buoncompagno (1502-1585) was elected pope in 1572.

[757] He was a Calabrian, and as early as 1552 was professor of medicine at Perugia. In 1576 his manuscript on the reform of the calendar was presented to the Roman Curia by his brother, Antonius. The manuscript was not printed and it has not been preserved.

[758] The title of this work, which is the authority on all points of the new Calendar, is _Kalendarium Gregorianum Perpetuum. Cum Privilegio Summi Pontificis Et Aliorum Principum. Romae, Ex Officina Dominici Basae. MDLXXXII. Cum Licentia Superiorum_ (quarto, pp. 60).--A. De M.

[759] _Manuels-Roret. Theorie du Calendrier et collection de tous les Calendriers des Annees passees et futures_.... Par L. B. Francoeur,... Paris, a la librairie encyclopedique de Roret, rue Hautefeuille, 10 bis. 1842. (12mo.) In this valuable manual, the 35 possible almanacs are given at length, with such preliminary tables as will enable any one to find, by mere inspection, which almanac he is to choose for any year, whether of old or new style. [1866. I may now refer to my own _Book of Almanacs_, for the same purpose].--A. De M.

Louis Benjamin Francoeur (1773-1849), after holding positions in the Ecole polytechnique (1804) and the Lycee Charlemagne (1805), became professor of higher algebra in the University of Paris (1809). His _Cours complet des mathematiques pures_ was well received, and he also wrote on mechanics, astronomy, and geodesy.

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