HANSEN, EMIL CHRISTIAN (1842-1909) , Danish bota nist, was born on May 8, 1842, at Ribe, Jutland. He studied art at Copenhagen but in 1871 turned to science. From 1877 he was head of the physiological department of the Carlsburg institute. Hansen's researches were concerned chiefly with fungi and alco holic fermenting yeasts. He was able to prove that there are different species of yeast and that they may be cultivated from a single cell. The yeast grown from single cells is now largely used in the bottom-fermentation breweries of the Continent. Hansen died at Copenhagen on Aug. 26, 1909. Besides numerous articles in periodicals, he wrote Untersuchungen ens der Praxis der Gar ungsindustrie (2 vols., 3rd. ed., 1892-95. Eng. trans., 1896) and Gesammelte theoretische Abhandlungen uber Garungsorganismen (191I).