From the blog "Musings from Valhalla"

October is Down syndrome awareness month, so I'd like to do my part and spread awareness of this often misunderstood syndrome.  In 1866, Dr. John Langdon Down, a British physician described the syndrome and called it "mongolism".  Until the 1970s, people with Down syndrome were called "mongoloids".  In 1959 a French geneticist discovered that individuals with Down syndrome possessed an extra chromosome.  The correct name is Down syndrome, not Down's syndrome.  In the past, individuals with Down