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lectures and physics

TYNDALL, fin'dal, John, British physi cist: b. Leighlin Bridge, County Carlow, Ireland, 21 Aug. 1820,- d. Haslemere, Surrey, 4 Dec. 1893. After secondary schooling he joined the Ord mace Survey, with which he was connected for five years. He was then engaged in railway work, and in 1847 became a teacher of physics at Queenwood College, Hants. After studying in Berlin and becoming acquainted with Fara day, Huxley and other eminent men, he was ap pointed professor of physics in the Royal Insti tution, London, with which he continued to be connected till his retirement in 1887. Tyndall did a vast amount of valuable work by original investigation in various branches of science, especially magnetism, electricity, heat, light and sound, on which he published many papers and several well-known volumes. Among these are 'Notes of a Course'of Nine Lectures on Light' (1870) ;

glacial phenomena. In 1872-73 he lectured in the United States, and in 1873 published