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 Abernethy and Sir William Lawrence, and in Paris, where he learnt analytical chemistry from P. J. Robiquet and toxicology from M. J. B. Orfila. In 1822 he returned to Edinburgh as professor of medical jurisprudence, and set to work to organize the study of his subject on a sound basis. On poisons in particular he speedily became a high authority; his well-known treatise on them was published in 1829, and in the course of his inquiries he did not hesitate to try such daring experiments on himself as taking large doses of Calabar bean. His attainments in medical jurisprudence and toxicology procured him the appointment, in 1829, of medical officer to the crown in Scotland, and from that time till 1866 he was called as a witness in many celebrated criminal cases. In 1832 he gave up the chair of medical jurisprudence and accepted that of medicine and therapeutics, which he held till 1877; at the same time he became professor of clinical medicine, and continued in that capacity till 1855. His fame as a toxicologist and medical jurist, together with his work on the pathology of the kidneys and on fevers, secured him a large private practice, and he succeeded to a fair share of the honours that commonly attend the successful physician, being appointed physician to Queen Victoria in 1848 and receiving a baronetcy in 1871. Among the books which he published were a treatise on Granular Degeneration of the Kidneys (1839), and a Commentary on the Pharmacopoeias of Great Britain (1842). Sir Robert Christison, who retained remarkable physical vigour and activity down to extreme old age, died at Edinburgh on the 23rd of January 1882.

CHRISTMAS (i.e. the Mass of Christ), in the Christian Church, the festival of the nativity of Jesus Christ. The history of this feast coheres so closely with that of (q.v.), that what follows must be read in connexion with the article under that heading.

The earliest body of gospel tradition, represented by Mark no less than by the primitive non-Marcan document embodied in the first and third gospels, begins, not with the birth and childhood of Jesus, but with his baptism; and this order of accretion of gospel matter is faithfully reflected in the time order of the invention of feasts. The great church adopted Christmas much later than Epiphany; and before the 5th century there was no general consensus of opinion as to when it should come in the calendar, whether on the 6th of January, or the 25th of March, or the 25th of December.

The earliest identification of the 25th of December with the birthday of Christ is in a passage, otherwise unknown and probably spurious, of Theophilus of Antioch ( 171–183), preserved in Latin by the Magdeburg centuriators (i. 3, 118), to the effect that the Gauls contended that as they celebrated the birth of the Lord on the 25th of December, whatever day of the week it might be, so they ought to celebrate the Pascha on the 25th of March when the resurrection befell.

The next mention of the 25th of December is in Hippolytus’ (c. 202) commentary on Daniel iv. 23. Jesus, he says, was born at Bethlehem on the 25th of December, a Wednesday, in the forty-second year of Augustus. This passage also is almost certainly interpolated. In any case he mentions no feast, nor was such a feast congruous with the orthodox ideas of that age. As late as 245 Origen, in his eighth homily on Leviticus, repudiates as sinful the very idea of keeping the birthday of Christ “as if he were a king Pharaoh.” The first certain mention of Dec. 25 is in a Latin chronographer of 354, first published entire by Mommsen. It runs thus in English: “Year 1 after Christ, in the consulate of Caesar and Paulus, the Lord Jesus Christ was born on the 25th of December, a Friday and 15th day of the new moon.” Here again no festal celebration of the day is attested.

There were, however, many speculations in the 2nd century about the date of Christ’s birth. Clement of Alexandria, towards its close, mentions several such, and condemns them as superstitions. Some chronologists, he says, alleged the birth to have occurred in the twenty-eighth year of Augustus, on the 25th of Pachon, the Egyptian month, i.e. the 20th of May. These were probably the Basilidian gnostics. Others set it on the 24th or 25th of Pharmuthi, i.e. the 19th or 20th of April. Clement himself sets it on the 17th of November, 3 The author of a Latin tract, called the De Pascha computus, written in Africa in 243, sets it by private revelation, ab ipso deo inspirati, on the 28th of March. He argues that the world was created perfect, flowers in bloom, and trees in leaf, therefore in spring; also at the equinox, and when the moon just created was full. Now the moon and sun were created on a Wednesday. The 28th of March suits all these considerations. Christ, therefore, being the Sun of Righteousness, was born on the 28th of March. The same symbolical reasoning led Polycarp (before 160) to set his birth on Sunday, when the world’s creation began, but his baptism on Wednesday, for it was the analogue of the sun’s creation. On such grounds certain Latins as early as 354 may have transferred the human birthday from the 6th of January to the 25th of December, which was then a Mithraic feast and is by the chronographer above referred to, but in another part of his compilation, termed Natalis invicti solis, or birthday of the unconquered Sun. Cyprian (de orat. dom. 35) calls Christ Sol verus, Ambrose Sol novus noster (Sermo vii. 13), and such rhetoric was widespread. The Syrians and Armenians, who clung to the 6th of January, accused the Romans of sun-worship and idolatry, contending with great probability that the feast of the 25th of December had been invented by disciples of Cerinthus and its lections by Artemon to commemorate the natural birth of Jesus. Chrysostom also testifies the 25th of December to have been from the beginning known in the West, from Thrace even as far as Gades. Ambrose, On Virgins, in. ch. 1, writing to his sister, implies that as late as the papacy of Liberius 352–356, the Birth from the Virgin was feasted together with the Marriage of Cana and the Banquet of the 4000 (Luke ix. 13), which were never feasted on any other day but Jan. 6.

Chrysostom, in a sermon preached at Antioch on Dec. 20, 386 or 388, says that some held the feast of Dec. 25 to have been held in the West, from Thrace as far as Cadiz, from the beginning. It certainly originated in the West, but spread quickly eastwards. In 353–361 it was observed at the court of Constantius. Basil of Caesarea (died 379) adopted it. Honorius, emperor (395–423) in the West, informed his mother and brother Arcadius (395–408) in Byzantium of how the new feast was kept in Rome, separate from the 6th of January, with its own troparia and sticharia. They adopted it, and recommended it to Chrysostom, who had long been in favour of it. Epiphanius of Crete was won over to it, as were also the other three patriarchs, Theophilus of Alexandria, John of Jerusalem, Flavian of Antioch. This was under Pope Anastasius, 398–400. John or Wahan of Nice, in a letter printed by Combefis in his Historia monothelitarum, affords the above details. The new feast was communicated by Proclus, patriarch of Constantinople (434–446), to Sahak, Catholicos of Armenia, about 440. The letter was betrayed to the Persian king, who accused Sahak of Greek intrigues, and deposed him. However, the Armenians, at least those within the Byzantine pale, adopted it for about thirty years, but finally abandoned it together with the decrees of Chalcedon early in the 8th century. Many writers of the period 375–450, e.g. Epiphanius, Cassian, Asterius, Basil, Chrysostom and Jerome, contrast the new feast with that of the Baptism as that of the birth after the flesh, from which we infer that the latter was generally regarded as a birth according to the Spirit. Instructive as showing that the new feast travelled from West eastwards is the fact (noticed by Usener) that in 387 the new feast was reckoned according to the Julian calendar by writers of the province of Asia, who in referring to other feasts use the reckoning of their local calendars. As early as 400 in Rome an imperial rescript includes Christmas among the three feasts (the others are Easter and Epiphany) on which theatres must be closed. Epiphany and Christmas were not made judicial non dies until 534. 