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Charles Robert Drysdale (1828/9–1907)
1828/9 Born in Edinburgh son of Sir William Drysdale
1836-42 attended Edinburgh Academy
1843 began to read mathematics at Edinburgh University but was probably with his brother George in Vienna in May 1844.
1846-7 read mathematics at Trinity College, Cambridge
1848 registered at the school of engineering in Dublin.
As a pupil of his cousin, George Willoughby Hemans, he surveyed railways in Ireland and on the continent.
1855 registered to study medicine at University College, London
1856 His paper "On steep gradients" won the Telford medal
1859 First-class MD at St Andrews
With his wife and brother campaigned in support of various radical causes including contraception.
1874 Birth of son Charles Vickery Drysdale in Paris to Alice Vickery (Drysdale) (they never married).
Became president of the new Malthusian League and editor of "The Malthusian".
1907 Died on 2 December at Carson Road, West Dulwich, London.