HANN, JULIUS (1839-1921), Austrian meteorologist and climatologist, was born near Linz, Upper Austria, on March 23, 1839. In 1865 he became editor of the Zeitschri f t der Oester reichischen Gesellscha f t fur Meteorologie, and from 1877 was occupied in the Central Meteorological Institute at Vienna. In 1873 he was appointed professor of physics at the University of Vienna. He acquired a world-wide reputation for his works on atmospheric dynamics and thermodynamics, the "atmospheric pulse," cyclones and climatology. His principal works are Die Erde als Ganzes; Die Atmosphdre and Hydrosphere (1872); Handbuchi der Klimatologie, 3 v. (1908) ; Lehrbuch der Meteoro logie, 3d ed. (1914) and many papers in his own Zeitschri f t and the reports of the Akademie der Wissenschaf ten. He died in Vienna on Oct. 1, 1921.