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It is named after John Langdon Down, the British doctor who fully described the syndrome in 1866. Some aspects of the condition were described earlier by Jean-Ãtienne Dominique Esquirol in 1838 and Ãdouard SÃ©guin in 1844. In 1957, the genetic cause of Down syndrome, an extra copy of chromosome 21, was discovered.
John Brown - Africans in America John Brown was a man of action -- a man who would not be deterred from his ... On October 16, 1859, he led 21 men on a raid of the federal arsenal at Harpers Ferry, ... www.pbs.org/wgbh/aia/part4/4p1550.html - Cached John Brown and the Harpers Ferry Raid John Brown and the Harpers Ferry Raid. On October 16, 1859, abolitionist John Brown and several followers seized the United States Armory and Arsenal at Harpers Ferry. ... www.wvculture.org/History/jnobrown.htm... - Cached John Brown's Raid On 16 October 1859 John Brown led eighteen men-thirteen whites and five blacks-into ...