“…Wendt (1959), the definition proposed by Panse (1942) has been adopted in the present study; onset has been dated from the first appearance of psychiatric or neurological signs attributed retrospectively to Huntington's chorea. Providing that ages of onset were recorded to within three years and unless they had resided in different isothermal regions (defined below), subjects were drawn from all the descriptions in the source references cited in Appendix III of Brackenridge (1972) with the following additions: Althaus (1880), MacLeod (1881), King (1885), Diller (1889), Phelps (1892), Collins (1898), Evans (1908), Muller (1903), Strumpell (1908, Bahr (1912), Seip (1928), Casper (1930), von Santha (1931), Buck (1934), Kloos (1938), Lion and Kahn (1938), Chamberlain (1943), Cronin (1943), Reisner (1944), Laane (1951), Major (1951), Leese et al (1952), Shiman (1954), Souder (1954), Saetra (1958), Mackenzie-Van Der Noordaa (1960), Oltman and Friedman (1961), Muller-Kuppers and Stenzel (1963), Brothers (1964), Sourkes et al (1965), Calkins and Van Allen (1967), Korenyi and Whittier (1967), Starr (1967), Finn (1970), Guercio (1970), Ordofiez (1971), Fau et al (1971), and Wallace and Hall (1972).…”