DYSODILE

a yellowish or greenish foliated carbonaceous substance found in Sicily originally, and derived from the decay of minute organisms. When ignited, it burns and emits a very unpleasant smell, 26 DYSON DYSON, Sir Frank Watson, F.R.S., LL.D.(Edin.), British astronomer, born at Ashby 8th Jan., 1868, the son of a Paptist minister. Educated at Bradford Grammar School and Trinity College, Cambridge, he became chief a istant at the Royal Observatory, Green wich, in 1894, and secretary of the Royal Astronomical Society in 1899. Astronomer Royal for Scotjland in 1905, he was Astronomer Royal for England from 1910 to 1933. He was knighted in 1915.