Tyndall, John. Man of science. Born in County Carlow, Ireland, 1820. Joined the Irish Ordnance Survey in 1839. Was a railway engineer 1844-47. Studied at the Universities of Marburg and Berlin (1848-51). Became professor of natural philosophy in the Royal Institution in 1853. After an expedition to Switzerland with Professor Huxley in 1856 wrote, in conjunction with him, a treatise "On the Structure and Motion of Glaciers," presided at the meeting of the British Association at Belfast in 1874. Among his works are "Heat as a Mode of Motion," and "Fragments of Science." Died 1893.

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