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picturesquely situated. The railway terminus at Bandarawella is 18 m. from Badulla. Tea is cultivated by the planters, and rice, fruit and vegetables by the natives in the district.

BAEDEKER, KARL (1801–1859), German publisher, was born at Essen on the 3rd of November 1801. His father had a printing establishment and book-shop there, and Karl followed the same business independently in Coblenz. Here he began to issue the first of the series of guide-books with which his name is associated. They followed the model of the English series instituted by John Murray, but developed in the course of years so as to cover the greater part of the civilized world, and later were issued in English and French as well as German. Baedeker’s son Fritz carried on the business, which in 1872 was transferred to Leipzig.

BAEHR, JOHANN CHRISTIAN FELIX (1798–1872), German philologist, was born at Darmstadt on the 13th of June 1798. He studied at the university of Heidelberg where he was appointed professor of classical philology in 1823, chief librarian in 1832, and on the retirement of G. F. Creuzer became director of the philological seminary. He died at Heidelberg on the 29th of November 1872. His earliest works were editions of Plutarch’s Alcibiades (1822), Philopoemen, Flamininus, Pyrrhus (1826), the fragments of Ctesias (1824), and Herodotus (1830–1835, 1855–1862). But most important of all were his works on Roman literature and humanistic studies in the middle ages: Geschichte der römischen Litteratur (4th ed., 1868–1870), and the supplementary volumes, Die christlichen Dichter und Geschichtschreiber Roms (2nd ed., 1872), Die christlich-römische Theologie (1837), Geschichte der römischen Litteratur im karolingischen Zeitalter (1840).

BAEL FRUIT (Aegle marmelos). Aegle is a genus of the botanical natural order Rutaceae, containing two species in tropical Asia and one in west tropical Africa. The plants are trees bearing strong spines, with alternate, compound leaves each with three leaflets and panicles of sweet-scented white flowers. Aegle marmelos, the bael- or bel-fruit tree (also known as Bengal quince), is found wild or cultivated throughout India. The tree is valued for its fruit, which is oblong to pyriform in shape, 2-5 in. in diameter, and has a grey or yellow rind and a sweet, thick orange-coloured pulp. The unripe fruit is cut up in slices, sun-dried and used as an astringent; the ripe fruit is described as sweet, aromatic and cooling. The wood is yellowish-white, and hard but not durable. The name Aegle is from one of the Hesperides, in reference to the golden fruit; marmelos is Portuguese for quince.

BAENA, a town of southern Spain, in the province of Cordova; 32 m. by road S.E. of the city of Cordova. Pop. (1900) 14,539. Baena is picturesquely situated near the river Marbella, on the slope of a hill crowned with a castle, which formerly belonged to the famous captain Gonzalo de Cordova. Farming, horse-breeding, linen-weaving and the manufacture of olive-oil are the chief local industries. The nearest railway station is Luque (pop. 4972), 4 m. S.E. on the Jaén-Lucena line. The site of the Roman town (Baniana or Biniana) can still be traced, and various Roman antiquities have been disinterred. In 1292 the Moors under Mahommed II. of Granada vainly besieged Baena, which was held for Sancho IV. of Castile; and the five Moorish heads in its coat-of-arms commemorate the defence.

BAER, KARL ERNST VON (1792–1876), German biologist, was born at Piep, in Esthonia, on the 29th of February 1792. His father, a small landowner, sent him to school at Reval, which he left in his eighteenth year to study medicine at Dorpat University. The lectures of K. F. Burdach (1776–1847) suggested research in the wider field of life-history, and as at that time Germany offered more facilities for, and greater encouragement to, scientific work, von Baer went to Würzburg, where J. I. J. Döllinger (1770–1841), father of the Catholic theologian, was professor of anatomy. In teaching von Baer, Döllinger gave a direction to his studies which secured his future pre-eminence in the science of organic development. He collaborated with C. H. Pander (1794–1865) in researches on the evolution of the chick, the results of which were first published in Burdach’s treatise on physiology. Continuing his investigations alone von Baer extended them to the evolution of organisms generally, and after a sojourn at Berlin he was invited by his old teacher Burdach, who had become professor of anatomy at Königsberg, to join him as prosector and chief of the new zoological museum (1817). Von Baer’s great discovery of the human ovum is the subject of his Epistola de Ovo Mammalium et Hominis Genesi (Leipzig, 1827), and in the following year he published the first part of his History of the Evolution of Animals (Ueber die Entwickelungsgeschichte der Thiere), the second part following in 1837. In this work he demonstrated first, that the Graafian follicles in the ovary are not the actual eggs, but that they contain the spherical vesicle, which is the true ovum, a body about the one hundred and twentieth of an inch in diameter, wherein lie the properties transmitting the physical and mental characteristics of the parent or grandparent, or even of more remote ancestors. He next showed that in all vertebrates the primary stage of cleavage of the fertilized egg is followed by modification into leaf-like germ layers—skin, muscular, vascular and mucous—whence arise the several organs of the body by differentiation. He further discovered the gelatinous, cylindrical cord, known as the chorda dorsalis, which passes along the body of the embryo of vertebrates, in the lower types of which it is limited to the entire inner skeleton, while in the higher the backbone and skull are developed round it. His “law of corresponding stages” in the development of vertebrate embryos was exemplified in the fact recorded by him about certain specimens preserved in spirit which he had omitted to label. “I am quite unable to say to what class they belong. They may be lizards, or small birds, or very young mammalia, so complete is the similarity in the mode of formation of the head and trunk in these animals. The extremities are still absent, but even if they had existed in the earliest stage of the development we should learn nothing, because all arise from the same fundamental form.” Again, in his History of Evolution he suggests, “Are not all animals in the beginning of their development essentially alike, and is there not a primary form common to all?” (i. p. 223). Notwithstanding this, the “telic” idea, with the archetypal theory which it involved, possessed von Baer to the end of his life, and explains his inability to accept the theory of unbroken descent with modification when it was propounded by Charles Darwin and A. R. Wallace in 1858. The influence of von Baer’s discoveries has been far-reaching and abiding. Not only was he the pioneer in that branch of biological science to which Francis Balfour, gathering up the labours of many fellow-workers, gave coherence in his Comparative Embryology (1881), but the impetus to T. H. Huxley’s researches on the structure of the medusae came from him (Life, i. 163), and Herbert Spencer found in von Baer’s "law of development" the “law of all development” (Essays, i. 30). In 1834 von Baer was appointed librarian of the Academy of Sciences of St Petersburg. In 1835 he published his Development of Fishes, and as the result of collection of all available information concerning the fauna and flora of the Polar regions of the empire, he was appointed leader of an Arctic expedition in 1837, The remainder of his active life was occupied in divers fields of research, geological as well as biological, an outcome of the latter being his fine monograph on the fishes of the Baltic and Caspian Seas. One of the last works from his prolific pen was an interesting autobiography published at the expense of the Esthonian nobles on the celebration of the jubilee of his doctorate in 1864. Three years afterwards he received the Copley medal. He died at Dorpat on the 28th of November 1876.  (E. Cl.) 

BAER, WILLIAM JACOB (1860–), American painter, was born on the 29th of January 1860 in Cincinnati, Ohio. He studied at Munich in 1880–1884. He had much to do with the revival in America of the art of miniature-painting, to which he turned in 1892, and was the first president of the Society of Painters in Miniature, New York. Among his miniatures are “The Golden Hour,” “Daphne,” “In Arcadia” and “Madonna with the Auburn Hair.”

BAETYLUS (Gr. βαίτυλος, βαιτύλιον), a word of Semitic origin (= bethel) denoting a sacred stone, which was supposed to be endowed with life. These fetish objects of worship were meteoric stones, which were dedicated to the gods or revered as symbols of the gods themselves (Pliny, Nat. Hist. xvii. 9; Photius, Cod. 242).