BOGUSLAWSKI, Palm Henri Louis von, German astronomer: b. Madgeburg, 7 Sept. 1789; d. Breslau, 5 June 1851. He was enrolled in the army for the campaign of 1806 and afterward studied astronomy. Called to Berlin in 1809, made lieutenant in 1811, he con tinued his astronomical studies under Bode, and through the latter was enabled to visit the prin cipal observatories of Europe from 1812 to 1815. He was wounded at Culm, taken prisoner but escaped to Bohemia and joined his corps at Erfurt. He retired from military service after Waterloo and for many years his failing sight forced him to abandon his astronomical obser vations. In 1831 he was appointed curator of the Breslau observatory, became professor at the university there in 1836 and director of the observatory in 1843. On 20 April 1835 he dis= covered the comet known by his name. His principal work is 'Uranus' (3 vols., Glogau 1846-48).
bo-ha-ed'din, or BOHAD DIN, Arabian scholar and historian: b. Mosul, 1145; d. 1235. Having attained proficiency in Moslem law, he became, at the age of 27, a lecturer at Bagdad. In 1186 he made the pil
grimage to Mecca, and while in Damascus on his return, he was appointed cadi of Jerusalem and of the Moslem army camp by Saladin, who was desirous of availing himself of the services and influence of so able a scholar, and a man of such reputed Moslem piety and zeal. He accordingly brought his learning and talent to the work of glorifying the wars of that • ambitious monarch, in a treatise on the 'Laws and Discipline of Sacred War.' On the death of Saladin he transferred his attachment to the son, Malek-al-Dhaher, whom he was instrumental in establishing in the succession to the throne. He was appointed cadi of Aleppo, and there founded a college, at which he continued to give lectures until he was 90 years old. His great work was, how ever, the 'Life of Saladin,' which was pub lished with a Latin translation at Leyden in 1732. Consult C. R. Conder's edition of the 'Life of Saladin' with notes by C. Wilson (London 1897).