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 that the Chinese empire was established previous to that epoch; but it is obviously so easy to extend the cycles backwards indefinitely, that the inference can have very little weight. The characters given to that year 2357 are Keă-shin, which denote the 41st of the cycle. We must, therefore, suppose the cycle to have begun 2397, or forty years before the reign of Yao. This is the epoch assumed by the authors of L’Art de vérifier les dates. The mathematical tribunal has, however, from time immemorial counted the first year of the first cycle from the eighty-first of Yao, that is to say, from the year 2277

Since the year 163 the Chinese writers have adopted the practice of dating the year from the accession of the reigning emperor. An emperor, on succeeding to the throne, gives a name to the years of his reign. He ordains, for example, that they shall be called Ta-te. In consequence of this edict, the following year is called the first of Ta-te, and the succeeding years the second, third, fourth, &c., of Ta-te, and so on, till it pleases the same emperor or his successor to ordain that the years shall be called by some other appellation. The periods thus formed are called by the Chinese Nien-hao. According to this method of dating the years a new era commences with every reign; and the year corresponding to a Chinese date can only be found when we have before us a catalogue of the Nien-hao, with their relation to the years of our era.

For Hindu Chronology, see the article under that heading.

.—In addition to the early Greek writings already named, there are the forty books (some fifteen only extant in their entirety) of universal history compiled (about 8 ) by Diodorus Siculus, and arranged in the form of annals; the Pentabiblos of Julius Africanus (about 220–230 ); the treatise of Censorinus entitled De die natali, written 238 ; the Chronicon, in two books, of Eusebius Pamphili, bishop of Caesarea (about 325 ), distinguished as the first book of a purely chronological character which has come down to us; and three important works forming parts of the Corpus Scriptorum Historiae Byzantinae, namely, the Chronographia of Georgius Syncellus (800 ), the Chronographia of Johannes Malalas (9th century), and the Chronicon Paschale.

Among works on Chronology, the following, which are arranged in the order of their publication, have an historical interest, as leading up to the epoch of modern research:—

1583. De Emendatione Temporum, by Joseph Scaliger, in which were laid the foundations of chronological science.

1603. Opus Chronologicum, by Sethus Calvisius.

1627. De Doctrina Temporum, by Petavius (Denis Petau), with its continuation published in 1630, and an abridgment entitled Rationarium Temporum, in 1633–1634.

1650. Annales Veteris et Novi Testamenti, by Archbishop Ussher, whose dates have by some means gained a place in the authorized version of the Bible.

1651. Regia Epitome Historiae Sacrae et Profanae, by Philippe Labbe, of which a French version was also published.

1669. Institutionum Chronologicarum libri duo, by Bishop Beveridge.

1672. Chronicus Canon Aegyptiacus, Ebraicus, et Graecus, by Sir John Marsham.

1687. L’Antiquité des temps rétablie et défendue, by Paul Pezron, with its Defense, 1691.

1701. De Veteribus Graecorum Romanorumque Cyclis, by Henry Dodwell.

1728. The Chronology of Ancient Kingdoms amended, by Sir Isaac Newton, remarkable as an attempt to construct a system on new bases, independent of the Greek chronologers.

1738. Chronologie de l’histoire sainte, by Alphonse des Vignolles.

1744. Tablettes chronologiques de l’histoire universelle, by N. Lenglet-Dufresnoy.

1750. The first edition in one vol. 4to of L’Art de vérifier les dates, which in its third edition (1818–1831) appeared in 38 vols. 8vo, a colossal monument of the learning and labours of various members of the Benedictine Congregation of Saint-Maur.

1752. Chronological Antiquities, by John Jackson.

1754. Chronology and History of the World, by John Blair; new edition, much enlarged (1857).

1784. A System of Chronology, by Playfair.

1799. Handbuch der Geschichte der Staaten des Alterthums, by A. H. L. Heeren.

1803. Handbuch der alten Geschichte, Geographie, und Chronologie, by G. G. Bredow, with his Historische Tabellen.

1809–1814. New Analysis of Chronology, by William Hales.

1819. Annales Veterum Regnorum, by C. G. Zumpt.

1821. Tableaux historiques, chronologiques, et géographiques, by Buret de Longchamps.

1824–1834. Fasti Hellenici, and 1845–1850, Fasti Romani, by H. Fynes Clinton. Epitomes of these elaborate works were published, 1851–1853.

1825–1826. Handbuch der mathematischen und technischen Chronologie, by Christian Ludwig Ideler; and his Lehrbuch der Chronologie, (1831).

1833. The Chronology of History, by Sir Harris Nicolas.

1852. Fasti Temporis Catholici, by Edward Greswell; and by the same author (1854), Origines Kalendariae Italicae; and 1862, Origines Kalendariae Hellenicae.

More modern works are the Encyclopaedia of Chronology, by B. B. Woodward and W. L. R. Cates (1872); and J. C. Macdonald’s Chronologies and Calendars (1897). But see the separate historical articles in this work.

 CHRUDIM, a town of Bohemia, Austria, 74 m. E.S.E. of Prague by rail. Pop. (1900) 13,017, mostly Czech. It has an important horse market, besides manufactures of sugar, spirits, beer, soda-water and agricultural machinery. There are also steam corn-mills and saw-mills. Chrudim is mentioned as the castle of a gaugraf as early as 993. The new town was founded by Ottokar II., who settled many Germans in it and gave it many privileges. After 1421 Chrudim was held by the Hussites, and though Ferdinand I. confiscated most of the town property, it prospered greatly till the outbreak of the Thirty Years’ War. In 1625 the greater part of its Hussite inhabitants left the town, which suffered much later on from the Swedes. Chrudim was the birthplace of Joseph Ressel (1793–1857), honoured in Austria as the inventor of the screw propeller.

 CHRYSANTHEMUM (Chrysanthemum sinense; nat. ord. Compositae), one of the most popular of autumn flowers. It is a native of China, whence it was introduced to Europe. The first chrysanthemum in England was grown at Kew in 1790, whither it had been sent by Mr Cels, a French gardener. It was not, however, till 1825 that the first chrysanthemum exhibition took place in England. The small-flowered pompons, and the grotesque-flowered Japanese sorts, are of comparatively recent date, the former having originated from the Chusan daisy, a variety introduced by Mr Fortune in 1846, and the latter having also been introduced by the same traveller about 1862. The Japanese kinds are unquestionably the most popular for decorative purposes as well as for exhibition. They afford a wide choice in colour, form, habit and times of flowering. The incurved Chinese kinds are severely neat-looking flowers in many shades of colour. The anemone-flowered kinds have long outer or ray petals, the interior or disk petals being short and tubular. These are to be had in many pleasing colours. The pompon kinds are small flowered, the petals being short. The plants are mostly dwarf in habit. In the single varieties the outer or ray florets alone are large and attractively coloured.

Plants for the Border.—As a border plant out of doors the chrysanthemum is of the easiest culture. It is an exceptionally good town plant. By a judicious selection of varieties, flowers may be produced in abundance and in considerable variety from August to the end of November, and in favourable seasons well on towards Christmas. Since 1890 when the English market was flooded with French raised varieties of exceptional merit, the border chrysanthemum has taken first place among hardy autumn flowering plants. Most of the varieties then introduced have been superseded by many excellent kinds raised in Britain.

Propagation.—The old English method of dividing the plants in March or early April may be followed where better means of propagation are not practicable. Many of the best border varieties are shy in producing new growths (suckers) from the rootstock, and are in consequence not amenable to this method. It is better to raise the plants from cuttings. This may be begun in January for the early flowering sorts, the late kinds being propagated during February and March. They will root quite well in a cold frame, if protected during frosty weather by litter or other similar material. If the frame can be heated at will so as to maintain a fairly even temperature of from 40° to 50° Fah., roots will be made more quickly and with more certainty. A still better method is to improvise a frame near the glass in a greenhouse, where the temperature is not raised above 50° by artificial heat. This has the advantage of being accessible in all weathers. The bottom of the frame is covered with sifted coal ashes or coco-nut fibre, on which the shallow boxes or pots used in propagating are placed. These are well drained with broken crocks, the bottoms of the boxes being drilled to allow water to pass out quickly. The soil should consist of about equal parts of fibrous loam and leaf-mould, half a part of coarse silver-sand, and about a quart of vegetable ash from the garden refuse heap to each bushel of the compost. The whole should be passed through a quarter inch sieve and thoroughly mixed. The coarse leaf-mould, &c., from the sieve should be spread thinly over the drainage, and the boxes or pots filled almost to the rims with the compost, and