Irish mathematician, born in Cork, in 1827; educated at Kilkenny College, and at Trinity College, Dublin, graduating at the latter in 1848, and being elected fellow in 1852, appointed a college tutor in 1858, and professor of natural philosophy in 1884, in that institution. He was elected a fellow of the Royal Society in 1879, and received the honorary degree, D.C.L., from the University of Oxford in 1892. Besides publishing A Treatise on the Differential Calculus (8th ed., 1892); A Treatise on the Integral Calculus (6th ed., 1891); and an Introduction to the Mathematical Theory of the Stress and Strain of Elastic Solids (1894), he also contributed to this Encyclopædia the articles on Infinitesimal Calculus, Maclaurin, Variable, and Variations.
